Cut the marzipan into cubes. Mix fat, 75 g sugar, marzipan and salt with the whisk of the hand mixer. Stir in the eggs one after the other. Stir in flour, baking powder and milk.
Put the dough into a well greased fruit base mould (26 cm Ø) sprinkled with flour and smooth it down. Bake in a preheated oven (electric: 175 °C/ gas: level 2) for 20-25 minutes. In the meantime, clean and wash the rhubarb and cut it into 2-3 cm long pieces.
Remove the fruit base from the oven, let it cool down a little on a grid, turn out of the mould and let the base cool down. Bring apple juice, remaining sugar and lemon juice to the boil. Add the rhubarb and cook covered for 2-3 minutes at low heat
In the meantime peel and slice the bananas. Stir starch and 5 tablespoons of water until smooth. Soak gelatine in cold water. Stir the starch into the rhubarb and let it swell for about 1 minute at low heat.
Fold in the bananas and let them cool down a little. In the meantime whip cream and vanilla sugar. Dissolve squeezed out gelatine at low heat and stir Amaretto into the gelatine. Whip the cream until stiff, adding the gelatine-maretto mixture drop by drop.
Spread the cream on the cake base (may go slightly over the edge) and chill for about 15 minutes. Then spread the rhubarb on top and refrigerate for another 45 minutes. Crumble 2 meringue.
Sprinkle the cake with it and decorate the cake edge with remaining meringue. Makes about 12 pieces.