Mix flour, icing sugar and salt in a mixing bowl. Add 100 g butter in pieces and 1 egg and knead first with the dough hooks of the hand mixer, then with your hands to a smooth dough
Then spread the dough evenly in a greased pie mould (24 cm ∅) and shape into a smooth base with your hands. Press the dough up at the edge. Prick the dough base several times with a fork. Line with baking paper, fill in dried peas. Bake blind in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 10 minutes, remove from oven. Remove paper and dry peas. Bake at the same temperature for another 8 minutes. Remove the base from the oven and let it cool down
Separate 3 eggs. Sort raspberries. Halve and squeeze the lemons (300 ml lemon juice). Puree 300 g raspberries with some lemon juice and pass through a sieve. Boil up lemon-raspberry puree with 300 g sugar, 75 g butter and lemon juice. Stir the starch and 7 tbsp. water until smooth, thicken the puree with it and let it simmer for about 1 minute while stirring. Remove from the stove. Mix 6 egg yolks and 2 tbsp. hot cream, then stir into the remaining cream. Pour the cream into the tin and bake again at the same temperature for about 12 minutes
Take the cake out of the oven. Let it cool down. Puree the rest of the raspberries and pass through a sieve. Beat 3 egg whites until stiff, gradually add 150 g sugar. Continue beating briefly until the meringue is shiny. Fold in marshmallows, fold in 2 tbsp. raspberry sauce and spread loosely on the pie. Flambé with a Bunsen burner until brown. Add the rest of the raspberry puree as sauce
waiting time approx. 3 1/2 hours