Separate the eggs and chill the egg white. Quickly knead 200 g flour, egg yolk, 50 g sugar, 1 pinch of salt and 120 g butter in pieces to make the shortcrust pastry. Wrap in foil and chill for about 30 minutes.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Grease the tart mould with lifting base (24 cm Ø). Roll out the dough on a floured sheet of baking paper until round (approx. 28 cm Ø).
Turn the paper into the mould. Carefully peel off the paper, press the dough gently at the bottom and sides. Prick several times with a fork. Cover with baking paper and place pulses on top. Bake in the hot oven on the lower shelf for about 15 minutes.
Take out, remove pulses and paper. Continue baking for about 5 minutes. Remove and let cool on a cake rack.
Spread the tart base with caramel cream. Peel and slice the bananas and spread them on the tart. Whip the sour cream and 75 g sugar, spread on the bananas and smooth it down. Chill for about 2 hours.
Shortly before serving, beat the egg whites until very stiff and finally add 100 g of sugar. Continue beating for 1-2 minutes. Pour the egg whites into a piping bag with a perforated spout and squirt small tuffs onto the sour cream.
Carefully flame off briefly with a kitchen gas burner.