Easy Steak Sandwich with Raclette, Cajun Mayo and Pickled Onions
A good steak sandwich has to be generous, but it also has to stay balanced. Here, the richness comes from thin slices of seared bavette and melted raclette, while the pickled onions bring vinegar, sweetness and crunch. The mistake to avoid is cooking the steak like a full steak. Once it is sliced thin, it cooks in a minute or two, and that is what keeps it juicy.
This recipe is based on my YouTube video, with a few adjustments since publication. I kept the spirit of the original sandwich, but I added clearer quantities, a proper frying temperature for the onions, and safer storage guidance for the homemade Cajun mayo.
A steak sandwich is a hot sandwich made with sliced beef, toasted bread, sauce and toppings. This one is different because it is built almost like bistro fast food: bavette, raclette cheese, homemade Cajun mayo, pickled onions and fried onion rings. I make it when I want something hearty, fast and a little exaggerated, but still cooked properly.
What Makes This Recipe Different
This is not the same sandwich as my garlic butter steak sandwich. That one is more about garlic butter and the direct flavor of the beef. This version is sharper, creamier and more layered because the pickled onions and Cajun mayo do a lot of work.
I make it this way because bavette has real beef flavor, but it needs to be treated with respect. If it is sliced thinly across the grain and cooked quickly, it stays tender. If it sits too long in the pan, it becomes dry and chewy. What I look for here is color on the meat, melted cheese, and bread that is toasted enough to hold the sauce without falling apart.
The raclette is important too. It melts into the hot beef without becoming stringy in a bad way. It gives the sandwich that salty, creamy, slightly funky cheese flavor that works very well with vinegar. For another steak idea with a faster pan method, the 15-minute steak bites are a good companion recipe.
Ingredients You Need
For the beef, use bavette if you can find it. Flank steak or hanger steak can also work, but the key is slicing thinly across the grain. The meat should be well chilled when you cut it, because cold beef is easier to slice neatly.
For the bread, I prefer baguette. It has enough crust to hold the mayo, pickled onions, hot beef and fried onions without turning into paste. Soft sandwich bread would make this too heavy and too wet.
The Cajun mayo is simple: egg, vinegar, Dijon, Cajun spices, salt and neutral oil. Use a tall narrow container if you are using an immersion blender. It helps the emulsion form quickly. The mayo should look thick, glossy and spoonable, not runny.
The pickled onions are there to wake up the sandwich. Without them, this would be rich on rich: beef, cheese, mayo and fried onions. With them, every bite has acidity.
The fried onion rings are optional if you are in a rush, but they make the sandwich much better. If you want a separate onion ring recipe, the milk and flour onion rings follow the same simple idea, while the crispy panko onion rings give you a thicker crunchy coating.
Step-by-Step Instructions
1. Make the Cajun mayo
Add the egg, vinegar, Dijon mustard, Cajun spices and salt to a tall container. Start blending, then slowly pour in the oil until the mayo thickens. You know it is ready when the blender leaves tracks in the sauce and the texture holds on a spoon.
I prefer to make the mayo first because it can sit in the fridge while the rest of the recipe moves forward. Important note: because this mayo uses raw egg, keep it refrigerated and use it within 3 to 4 days. For extra safety, use a pasteurized egg.
2. Make the pickled onions
Slice the onions and place them in a clean jar or heatproof container. Bring the vinegar, sugar, salt, pepper, thyme and bay leaves to a boil. Stir until the sugar and salt dissolve, then pour the hot liquid over the onions.
Press the onions down so they are covered. Let them cool, then refrigerate. They can be used the same day, but they are better after a few hours. They should taste sharp, slightly sweet and aromatic.
3. Prepare the fried onions
Slice one onion into rings and separate the rings by hand. Cover them with milk while you prepare the meat and bread. When ready to fry, drain the onions, coat them in flour, shake off the excess and fry at 350°F to 360°F.
They only need about 2 minutes. Listen to the oil: it should bubble steadily, not violently. If the onions brown too fast, the oil is too hot. If they absorb oil and stay pale, the oil is too cold. Drain them on paper towel and salt them right away.
4. Slice and cook the steak
Slice the bavette thinly across the grain. Heat a pan hard, then add a little duck fat or neutral oil. Add the steak slices in a single layer if possible. Season with salt and sear quickly.
This part is fast. The meat should brown but still look juicy. Once the slices are nearly done, turn off the heat, place raclette over the beef, cover the pan and let the cheese melt from the remaining heat.
5. Toast and build the sandwich
Split the baguette and toast it lightly. Spread Cajun mayo on both sides. Add pickled onions to the bottom, then the hot beef and melted raclette. Finish with fried onion rings and close the sandwich.
Serve right away. This is not a sandwich to assemble one hour ahead. The bread, fried onions and hot cheese are at their best immediately.
Why This Recipe Works
The balance is the whole recipe. Bavette and raclette bring richness. Cajun mayo adds spice and fat. Pickled onions add acidity. Fried onions add texture. Toasted baguette gives structure.
It is also a good way to use steak in a sandwich without needing a huge piece of meat per person. Because the beef is sliced thin and layered with cheese and toppings, a reasonable amount of meat still feels generous.
If you are building a steak dinner instead of a sandwich, look through my best steak recipes or the broader list of easy beef dinners. This sandwich sits somewhere between a steakhouse plate and a fast-food craving.
Common Mistakes to Avoid
The first mistake is overcooking the meat. Thin steak slices do not need a long cook. High heat, quick color, stop. The cheese will finish warming everything.
The second mistake is using too much pickle liquid in the sandwich. Shake the pickled onions before adding them. You want acidity, not a wet baguette.
The third mistake is frying onions without controlling the oil temperature. A thermometer helps. If you do not have one, test with one onion ring first. It should sizzle immediately and brown in about 2 minutes.
The last mistake is building the sandwich on soft, untoasted bread. The sauce and steak juices need a little crust to hold them.
What to Serve With It
For a big plate, serve it with crispy homemade hash browns or a small bowl of creamy potato salad. If you want to stay in the sandwich mood, the Quebec Reuben and the Montreal club sandwich are good recipes to compare because they are also built around bread, sauce and strong fillings.
For a lighter side, a sharp salad works better than another heavy dish. A simple Greek salad gives you tomatoes, cucumber, feta and acidity, which cuts through the raclette and mayo.
Substitutions
Bavette is my first choice, but flank steak, skirt steak or hanger steak can work. The important point is slicing across the grain. If using leftover steak, slice it thin and warm it gently with the cheese instead of cooking it again hard.
Raclette can be replaced with provolone, Swiss cheese, Monterey Jack or mozzarella. Raclette gives the strongest bistro-style result, but any good melting cheese will work.
For the sauce, Cajun mayo can be replaced with a spicy mayo, garlic mayo or even homemade sauce samourai if you want a different spicy direction. The sandwich will be less Cajun, but still very good.
The fried onions can be skipped if you are short on time, but I would keep the pickled onions. They are what stop the sandwich from becoming too heavy. If you want a more burger-style meal, the steak burger with mushrooms or my page of homemade burger recipes gives you other ideas in the same comfort-food family.
FAQ
Can I make the Cajun mayo ahead of time?
Yes, but keep it refrigerated and use it within 3 to 4 days. Since it contains raw egg, use a pasteurized egg if you want extra safety.
Can I make the pickled onions ahead?
Yes. They are actually better after a few hours in the refrigerator. Keep them cold and use clean utensils when removing them from the jar.
What steak is best for this sandwich?
Bavette is excellent because it has strong beef flavor. Flank steak, skirt steak or hanger steak can also work, as long as you slice thinly across the grain.
Can I use another cheese?
Yes. Raclette melts beautifully, but provolone, Swiss cheese, mozzarella or Monterey Jack can work.
How do I keep the bread from getting soggy?
Toast the baguette and drain the pickled onions before adding them. Assemble the sandwich right before serving.
Can I make this without fried onions?
Yes. The sandwich still works with just the pickled onions, steak, cheese and sauce. The fried onions add crunch, but they are not mandatory.
Suggested Posts
For another hot beef sandwich, try the garlic butter steak sandwich.
For a fast pan-seared beef recipe, make the 15-minute steak bites.
For more steak ideas, browse the best steak recipes.
For more easy beef dinners, see the weeknight beef recipe collection.
For the crunchy topping, use the milk and flour onion rings.
For a different sauce idea, try the homemade sauce samourai.
Easy Steak Sandwich with Raclette, Cajun Mayo and Pickled Onions
Ingredients
- 2 small baguettes or 1 large baguette cut into 2 portions
- 1 lb bavette steak flank steak or hanger steak
- 6 to 8 slices raclette cheese
- 1 tablespoon duck fat or neutral oil
- Salt to taste
- 1 egg
- 1 tablespoon rice vinegar or white vinegar
- 1 tablespoon Dijon mustard
- 1 tablespoon Cajun spice mix
- 1 pinch salt
- 1 cup neutral vegetable oil
- 2 medium onions thinly sliced
- 1 cup white vinegar
- 2 tablespoons sugar
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
- 2 sprigs thyme
- 2 bay leaves
- 1 large onion sliced into rings
- 1 cup milk or enough to cover the onion rings
- 1 cup all-purpose flour or as needed
- Neutral oil for frying
- Salt to taste
Instructions
- Make the Cajun mayo by blending the egg, vinegar, Dijon, Cajun spices and salt in a tall container.
- Slowly add the vegetable oil while blending until the mayo is thick and smooth. Refrigerate.
- Place the sliced onions in a clean jar or heatproof container.
- Bring the white vinegar, sugar, salt, pepper, thyme and bay leaves to a boil.
- Pour the hot vinegar mixture over the onions, cover, cool and refrigerate.
- Slice the large onion into rings and soak in milk while preparing the sandwich.
- Slice the bavette thinly across the grain.
- Heat a pan over high heat, add duck fat or oil, then sear the steak slices quickly with salt.
- Turn off the heat, place raclette over the steak, cover and let the cheese melt.
- Toast the baguette pieces until lightly crisp.
- Drain the onion rings, coat in flour and fry at 350°F to 360°F for about 2 minutes.
- Drain the fried onions on paper towel and season with salt.
- Spread Cajun mayo on the toasted bread.
- Add pickled onions, steak with melted raclette and fried onion rings.
- Close the sandwiches and serve immediately.
