Preheat oven to 160°C (320°F). Remove the membrane from the ribs, rub with olive oil, salt, pepper and smoked paprika. Place in a baking dish, cover tightly with foil and bake 2 hours, until very tender.
On a baking sheet, toss onions, garlic and chilies with olive oil and salt. Roast 40–45 minutes at 160°C until soft and caramelized.
In a saucepan, cook brown sugar and maple syrup until lightly caramelized. Deglaze with red wine vinegar and reduce by half.
Add roasted onions, garlic (squeezed from skins), chilies, crushed tomatoes, roasting juices and water. Blend smooth, then simmer 15–20 minutes until thick and glossy. Season to taste.
Cut potatoes into fries, rinse and dry well. First fry at 150°C (300°F) for 5–6 minutes until just tender with no color. Drain. Right before serving, fry again at 180°C (355°F) for 3–4 minutes until golden and crispy. Drain and season with salt.
Increase oven to 220°C (425°F) or set to broil. Uncover ribs, brush generously with maple BBQ sauce and bake 10–15 minutes, brushing once or twice more, until the glaze is caramelized and sticky.
Rest 5–10 minutes, slice between the bones and serve with crispy fries and extra BBQ sauce.