Drain mozzarella and cut into slices. Finely chop 2 cloves garlic. In a bowl, mix 3 tablespoons balsamic vinegar, 1 teaspoon grainy mustard, 1 teaspoon honey, chopped garlic, salt and pepper. Coat mozzarella slices with marinade and refrigerate for 30 minutes.
Dice the 250 g cherry tomatoes. Halve the avocado, remove the stone, scoop out the pulp, dice it, and drizzle with 2 tablespoons lemon juice.
Place cleaned rocket on a plate and arrange the marinated mozzarella slices on top. Mix the remaining marinade with 4 tablespoons olive oil and remaining 2 tablespoons lemon juice. Fold in the diced avocado and tomatoes, then spread the mixture over the mozzarella. Sprinkle with dill if desired.