Dust the meat with the flour and mix. Clean the carrots and leek and cut into pieces or rings. Peel and roughly dice the onions and garlic.
Heat some olive oil in a pan and fry the onion and garlic cubes until translucent. Add the meat and stir-fry vigorously. Season with salt, pepper, curry and paprika.
When the meat is done sear, add the vegetables and sauté briefly. Stir in tomato paste and sugar and caramelize a little. Deglaze with white wine. Add the tomatoes, stir in and simmer on a low heat for 90 minutes. Season again to taste, fold in 1 tablespoon of crème fraîche and serve.