Cut the butter into pieces. Separate eggs. Chill the egg whites. Knead flour, butter, egg yolks, 50 g sugar, salt and 1-2 tbsp water to a smooth dough. Wrap dough in foil and put it in a cool place for about 30 minutes.
Roll out the dough on a floured work surface until round (approx. 28 cm Ø). Grease the tart mould with lift-off base (24 cm Ø) and line with the dough. Fold any protruding edges inwards.
Insert the dough several times with a fork, line with baking paper and fill with dried peas.
Bake the tart on the lower shelf in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 15 minutes in a blind oven. Then remove peas and paper and bake for another 5 minutes.
Remove the tart from the oven and let it cool down on a cake rack.
Spread the tart base with 3 tbsp. caramel cream. Peel and slice the bananas and spread them on the tart. Mix sour cream and 75 g sugar, put it on the bananas and smooth it down. Chill for about 2 hours.
Beat the egg whites until stiff, adding 100 g sugar at the end, continue beating for 1-2 minutes. Pour the meringue mixture into a piping bag with perforated spout. Decorate cake with tuffs. Briefly flame with a crème-brûlée burner.