For the sauce, mix all the ingredients together and put in the microwave for 25 seconds. Then stir briefly again and leave in the fridge overnight, the onions will rehydrate. Fry the minced meat, season with salt and pepper and leave to cool. Halve the hamburger buns, toast them and cut them into cubes of about 2 x 2 cm. For the look, reserve 4 lids for the top layer and dice these as well. Cut the iceberg lettuce into bite-sized pieces.
For the layered salad, first put 1/3 of the bun cubes into a large glass bowl. Then add half of the iceberg lettuce, half of the sauce and half of the meat.
Then add a layer of cheese slices, the rest of the bun cubes (except for those for the last layer), the remaining iceberg lettuce, the second half of the sauce, a layer of gherkin slices and the second half of the meat. Finally, place the bun lid cubes on the salad so that the sides with sesame seeds are on top.