Peel the shallots. Clean and possibly wash the mushrooms. Caramelise the sugar in a pan over low heat (not too dark). While stirring constantly, deglaze with vinegar and 75 ml water, bring to the boil, add shallots and season with salt and pepper.
Simmer at low heat for 8-10 minutes. After half of the time add the mushrooms. In the meantime, pour the mozzarella into a sieve and drain well. Clean, wash and slice the zucchini.
Wash the rocket and lettuce and drain well in a sieve. Remove the vinaigrette from the heat and carefully stir in the oil. Leave to cool. Seed melon with a tablespoon. Use a ball cutter to cut out balls from the melon pulp.
Mix the rocket, lettuce, melon, mozzarella, zucchini, shallots and mushrooms with the caramelized vinaigrette and arrange on four plates. Serve garnished with chervil as desired.