Remove the rhubarb from the leaves and cut into pieces approx. 4 cm long. Peel the bananas and cut into thin slices.
Mix the margarine and sugar until frothy. Mix the flour, almond sticks, baking powder and salt and add to the sugar-margarine mixture together with the soy milk, stirring constantly. Fold in pieces of rhubarb and banana.
Pour the dough into a greased springform pan with a diameter of 24 cm. Bake at 180 ° C for about 45 minutes.