Line the bottom of the springform pan with baking paper and preheat the oven to 180 degrees. Melt the butter, separate the eggs and beat the egg whites until stiff. Then beat the egg yolks with the sugar until frothy. Briefly stir in the flour, melted butter and egg whites.
Fill the dough into the springform pan and bake in the oven (center, fan oven 160 degrees) for about 35 minutes. Then let cool down a bit. Spoon the center of the cake 1 cm deep, leaving a 3 cm wide rim. For the icing, mix the powdered sugar with the lemon juice, color it pink with food coloring and brush the edge with it.
Bring the lemonade with the lemon juice, sugar and blue food coloring to a boil. Mix the cornstarch with a little water and stir in. Pour the pudding into the paddling pool and let it cool down. The waffles become air mattresses and the gummy bears the bathers.