Clean and wash the salad, pluck into bite-sized pieces and drain. Mix 100 g sour cream, milk, sugar and 1-2 tbsp. lemon juice thoroughly. Season to taste with salt and pepper.
Drain the tomatoes. Wash basil, shake dry, remove leaves except for something to garnish, pluck from stalks and chop. Grate cheese, mix with 150 g sour cream, basil and mustard, season with a little salt and pepper
Spread 4 slices of bread with a little cheese cream, cover each with 1 slice of ham. Spread some cheese cream on top, cover with 3 tomatoes each. Put another blob of cream on top, cover with 1 slice of bread each and press on a little
Melt butter in 2 large pans. Fry the bread in them for 2-3 minutes on each side until brown. Cut the breads diagonally in half, arrange them on a plate and garnish with basil. Drizzle salad with dressing, arrange in bowls and serve