Cream fat, sugar, vanillin sugar and salt with the whisk of the hand mixer. Add lime zest and juice of 1 lime and stir in. Stir in the eggs one after the other. Mix flour and baking powder and stir in. Grease a box cake tin with 6 trays (250 ml each) and dust with flour. Spread the dough in the hollows and smooth it down. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 30-40 minutes. Allow to cool for approx. 10 minutes, then carefully turn out onto a cake rack and let it cool down
Stir icing sugar and juice of 1 lime until smooth. If the icing is still too thick (but it should be very viscous) add some more water. Cover the cake with the icing. Decorate with Jelly Belly and let dry
waiting time approx. 3 hours