Preheat the oven for the burger cakes (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Line two baking trays with baking paper. Cream butter, sugar and lemon zest with the whisks of the mixer. Stir in eggs one after the other. Mix flour and baking powder, sieve onto the sugar-butter mixture and fold in.
Place 4-6 large blobs of dough on each of the two baking trays with a tablespoon, leaving a large gap between them. Bake one after the other in a hot oven for about 7 minutes, sprinkle with sesame seeds and decorating sugar, continue baking for about 4 minutes. Take out, let cool off.
For the sweet "mayo" break the chocolate into pieces, melt in a hot water bath and let it cool down for about 4 minutes. Whip the cream until stiff. Carefully fold it into the chocolate (do not stir too hard!). For the sweet "ketchup" fruit spread, stir until smooth. Wash and clean the strawberries and cut them into pieces. Peel the mango, first remove the flesh from the stone, then cut into small cubes. Mix fruit with syrup and lemon juice.
To serve, place 4-6 burger halves on plates with the flat side up. Spread sweet ketchup on them and put the fruits on top. Add sweet mayo. Place the remaining burger halves on top. Decorate as desired with mint leaves and roasted almond flakes.