Cook the peas in boiling salted water for about 4 minutes. Drain and quench briefly under cold water. Put 100 g peas aside. Mash the remaining peas
Mix eggs, crème fraîche and pea puree, season with salt and pepper. Pour the mixture into 4 ovenproof, greased tins (each with a capacity of approx. 200 ml) and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 25 minutes
Wash the mint, shake dry, pluck off the leaves and, except for a few for garnishing, chop them finely. Whip the oil under the lemon juice, season with salt, pepper and sugar. Stir in chopped mint. Put the slices of bacon in a pan without fat and let them drain on kitchen paper
Turn the flans onto plates, garnish with the remaining peas and drizzle with vinaigrette. Spread the sour cream and bacon on the flans. Garnish with mint. Serve cold or warm