Cut rolls in half horizontally and bake in a preheated oven (electric cooker: 190 °C/ circulating air: 180 °C/ gas: see manufacturer) for 5-10 minutes
Parry the meat, cut it into large cubes and turn it through the mincer. Season with salt, pepper and 2 tablespoons of mustard. Shape into about 30 small thin meatballs. Heat 4 tbsp. oil in portions in a large pan. Fry the burgers for about 3 minutes each while turning. Cook in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for five minutes
Place the eggs, 2 tablespoons of mustard, lemon juice, salt, pepper and 300 ml vegetable oil in a narrow tall beaker. Make a mayonnaise with a blender. Clean the salad and tear into burger-sized pieces. Wash and clean the tomatoes. Cut cucumbers and tomatoes into fine slices
Spread mayonnaise, a slice of tomato, burger, gherkin, a lettuce leaf and some mango chutney on each of the lower half of the burgers. Wash the herbs, shake dry, pluck the basil leaves from the stalks and chop finely. Cut the chives into small rolls. Sprinkle herbs over the burgers. Place the top of the burger rolls on top