Easy Potage Saint-Germain, Classic French Split Pea Soup
This Potage Saint-Germain turns dried green split peas, smoked bacon and a good chicken stock into a thick, smooth French soup with no cream required. Soaking the peas overnight helps them soften evenly, while adding the stock in stages keeps the bottom from catching. What I look for is a velvety consistency that slowly flows from the ladle rather than sitting in the bowl like mashed peas.
Potage Saint-Germain is a traditional French split pea soup, usually puréed until smooth and served with croûtons. It is more refined than a chunky pea soup but still hearty enough for a cold-weather lunch or a simple year-round supper.
This recipe is based on my YouTube video, with a few adjustments since publication. The written version clarifies the overnight soak, the amount of stock to reserve and the importance of seasoning only after the smoked bacon has flavoured the soup.
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What Makes This Potage Different
This is not a cream soup. The body comes entirely from the split peas as they soften and break down, which gives the finished potage a creamy texture without adding milk or heavy cream.
I make it this way because split peas absorb a surprising amount of liquid. Starting with part of the stock and keeping the rest nearby gives better control. If all the liquid evaporates while the peas are still firm, the soup becomes difficult to stir and can scorch before it is ready.
The smoked bacon cooks as one thick piece in the pot. It seasons the stock gradually and can be removed once tender, then cut into small pieces for the garnish. Thin breakfast bacon is not ideal here because it can become overly salty or disappear into the soup.
Compared with Potage Parmentier made with potatoes and leeks, this soup has a deeper earthy flavour and a denser texture. It is also different from a rustic green lentil soup with vegetables, which is served with the lentils and vegetables intact. This one should be completely smooth.
For more bowls built around vegetables, legumes and French techniques, browse these easy and comforting soup recipes.
Ingredients You Need
Dried green split peas: Use dried peas, not canned or fresh peas. Soak them overnight in plenty of cold water, then drain and rinse before cooking.
Yellow onion: The onion provides the aromatic base. It is chopped roughly because everything will be blended later.
Slab bacon or smoked pork belly: Choose one thick piece with a moderate level of salt. It should contribute smoke and richness without overpowering the peas.
Duck fat: Duck fat gives the onion and croûtons a subtle bistro-style richness. Only a small amount is needed.
Chicken stock: Use unsalted or low-sodium stock because the bacon already contains salt. A homemade vegetable stock may also be used for the soup base, although the overall flavour will be lighter.
Bread: Slightly stale white bread, country bread or baguette works well for croûtons. The surface should become crisp while the centre retains a little structure.
Salt and black pepper: Add these near the end. The final amount depends heavily on the saltiness of the bacon and stock.
Step-by-Step Instructions
1. Soak and drain the split peas
Place the dried split peas in a large bowl and cover them with several inches of cold water. Leave them to soak for 8 to 12 hours.
Drain the peas and rinse them under cold running water. Do not use the soaking water in the soup.
This step does not make the peas instantly tender, but it helps the one-hour cooking time from the video work more consistently. Unsoaked peas can take considerably longer, especially when they have been stored for a long time.
2. Sweat the onion without browning it
Heat 1 tablespoon of duck fat in a heavy-bottomed pot over medium-low heat. Add the roughly chopped onion and cook for 5 to 7 minutes, stirring often.
The onion should soften and turn translucent. It should not become golden or caramelized. Browning would introduce a sweeter, roasted onion flavour that belongs more naturally in classic French onion soup than in this delicate pea potage.
The mistake to avoid is using high heat because the pot will later simmer for a long time. Any dark bits left on the bottom can become bitter once the soup is blended.
3. Add the peas, bacon and stock
Add the drained split peas and the whole piece of smoked bacon. Pour in about 4 1/4 cups of the stock, keeping the remaining stock in reserve.
Bring the liquid gradually to a boil. As it heats, pale foam may collect around the edges and on the surface. Skim it away with a spoon or small ladle.
Once boiling, reduce the heat to maintain a gentle simmer. Aggressive boiling is unnecessary and causes the liquid to evaporate too quickly.
4. Simmer until completely tender
Cook for approximately 30 minutes, stirring regularly and scraping across the bottom of the pot. Add some of the reserved stock when the mixture begins to look thick or dry.
Check the bacon with the tip of a small knife. When the knife passes through easily, remove the bacon and set it aside. Depending on its thickness, this may take around 30 minutes.
Continue simmering the peas for another 30 to 45 minutes. You know they are ready when they crush immediately between two fingers and no firm centre remains. If the peas are still gritty, keep cooking and add more stock as needed.
Do not allow a heavy layer of peas to settle at the bottom. The soup needs more frequent stirring during the final part of cooking because the softened peas release starch and thicken the liquid quickly.
5. Make the croûtons
While the soup finishes, preheat the oven broiler. Cut the bread into small, even cubes and toss them with 1 tablespoon of melted duck fat or neutral oil.
Spread the bread in one layer on a baking sheet. Broil briefly, turning the cubes as they colour. Stay close to the oven because croûtons can move from pale to burnt very quickly under a broiler.
They are ready when the edges are golden and dry, with no soft or damp surface. For a more seasoned variation, use the method from these homemade garlic croûtons cooked with bacon drippings.
6. Blend and adjust the consistency
Remove the pot from the heat. Blend the soup with an immersion blender until no visible pieces of onion or pea remain.
For a very fine hotel-school finish, pass the blended soup through a fine-mesh sieve. This is optional, but it removes any remaining skins and gives the potage a more polished texture.
Return the soup to low heat. Add enough reserved stock to reach a smooth, pourable consistency. Season with black pepper and a small amount of salt, then taste again. The bacon may have already provided most of the salt needed.
Cut the reserved bacon into small pieces. Ladle the hot potage into bowls and garnish with bacon and crisp croûtons.
Chef’s Notes for the Right Texture
A finished split pea potage should coat a spoon, but it should still move. Drag a spoon across the bottom of the pot. The trail should close slowly within a second or two. If it remains open and the soup piles up, add warm stock a little at a time.
Do not judge the final thickness while the soup is boiling. It thickens further as it cools, and refrigerated leftovers become much denser. Keep a little extra stock for reheating.
Seasoning is the final step, not the first. Bacon, smoked pork belly and packaged broth vary too much in sodium to use one large fixed amount of salt safely.
Split peas provide substantial fibre and plant-based protein, while the bacon and croûtons make the soup more filling and savoury. The bacon can remain a small garnish rather than becoming the main component of each serving.
Storage and Reheating
Let the soup cool, then refrigerate it in a covered container for up to 4 days. Store the croûtons separately at room temperature so they remain crisp.
Reheat the potage gently in a saucepan. Add a splash of stock or water before it becomes hot, then whisk or stir until the original consistency returns. Avoid boiling it hard because the thick soup may spit and stick to the bottom.
The soup can be frozen without the bacon garnish and croûtons. Leave a little empty space in the container because liquids expand when frozen. Thaw it in the refrigerator, then reheat with additional stock.
Substitutions
Duck fat may be replaced with butter or olive oil. Butter gives a softer dairy richness, while olive oil keeps the flavour lighter.
Low-sodium vegetable stock can replace chicken stock. For a meatless version, omit the bacon and expect a less smoky result. A small amount of smoked paprika may add smoke, but it will also change the traditional flavour and colour.
Thick-cut bacon may be used when slab bacon is unavailable, but tie or stack the slices together so they can be removed before blending. Avoid heavily flavoured maple bacon because its sweetness changes the character of the soup.
Brown or yellow split peas can replace green split peas, although the finished colour and flavour will differ. Do not substitute whole dried peas without adjusting the soaking and cooking time.
FAQ
Do split peas need to be soaked overnight?
Split peas can cook without soaking, but this recipe uses an overnight soak because the cooking schedule in the original video is approximately one hour. Without soaking, allow additional time and keep more stock available.
Why is my split pea soup still grainy?
The peas are not fully cooked. Continue simmering until they collapse easily when pressed. Old dried peas may require more time even after soaking.
Why did the bottom of my soup burn?
The heat was likely too high, the pot was too thin or the soup was not stirred often enough. Once the peas begin to soften, scrape the bottom regularly and add reserved stock before the mixture becomes excessively thick.
Can I blend the bacon into the soup?
Remove the bacon before blending. Blended bacon can make the texture greasy and the flavour too salty. Cutting it into small pieces for the garnish gives better control in each serving.
Can I add cream?
Cream is not needed because properly cooked split peas already make the soup smooth and rich. A small spoonful can be added when serving, but it changes the cleaner flavour of the original version.
What should I serve with Potage Saint-Germain?
Serve it with crusty bread, a simple salad or a savoury tart. A slice of classic Quiche Lorraine turns a smaller bowl into a substantial French-style lunch.
Suggested Posts
Continue with an easy leek soup topped with cheesy croûtons when you want a milder vegetable soup.
Try this homemade Savoy cabbage soup for another rustic bowl built around economical ingredients.
Use up vegetables in a fridge-cleanout vegetable soup with a lighter, more flexible flavour profile.
Make a more substantial meal with homemade minestrone and pasta.
Serve the potage with cheese-stuffed garlic butter rolls when you want warm bread for dipping.
Explore more traditional French classics, sauces, stews and desserts.
Easy Potage Saint-Germain, Classic French Split Pea Soup
Ingredients
- 1 1/2 cups dried green split peas
- Cold water for soaking
- 1 large yellow onion roughly chopped
- 4 ounces slab bacon or smoked pork belly
- 1 tablespoon duck fat
- 6 1/3 cups unsalted or low-sodium chicken stock divided
- 1/2 teaspoon ground black pepper plus more to taste
- 1/2 to 1 teaspoon salt as needed
- 4 slices sturdy white or country bread cubed
- 1 tablespoon duck fat or neutral oil for the croûtons
Instructions
- Cover the split peas with cold water and soak for 8 to 12 hours, then drain and rinse.
- Heat the duck fat over medium-low heat and sweat the onion for 5 to 7 minutes without browning.
- Add the peas, bacon and about 4 1/4 cups stock. Bring to a boil and skim away the foam.
- Reduce to a gentle simmer and cook for 30 minutes, stirring regularly and adding reserved stock as needed.
- Remove the bacon when tender, then continue cooking the peas for 30 to 45 minutes until completely soft.
- Toss the bread cubes with duck fat or oil and broil, turning frequently, until golden and crisp.
- Blend the soup until smooth, strain if desired and add enough reserved stock for a pourable consistency.
- Season carefully with pepper and salt, then serve with chopped bacon and croûtons.
