Separate the egg, cover and chill the egg white. Knead 50 g sugar, butter in flakes, flour and egg yolk first with the dough hooks of the hand mixer then with your hands to a shortcrust pastry. Wrap the dough in foil and chill for about 30 minutes.
Roll out the short pastry on a floured work surface until round (approx. 30 cm Ø). Using the dough roller, place the dough in a greased tart mould (26 cm Ø; lift-off base), dust with flour.
Line with baking paper. Add the dried peas. Bake the shortcrust pastry in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 25 minutes until blind. Then remove peas and paper and bake the tart for another 10 minutes, take it out of the oven and let it cool down on a cake rack.
Peel and halve the papayas and remove the seeds. Cut papaya halves into slices. Spread the tart with lemon curd and spread papaya slices on top. Beat the egg whites with the whisk of the hand mixer until stiff, adding 50 g sugar.
Pour the beaten egg whites into a piping bag with a large star-shaped spout and squirt onto the edge of the tart, sprinkle with coconut flakes. Brown the tarte in a preheated oven at 200 °C (best if grill) for about 5 minutes.