Mix minced meat, breadcrumbs, egg and coarse mustard, season with salt and pepper and form into about 20 small meatballs. Wash and clean the leek and cut it into thirds lengthwise. Blanch in boiling salted water for about 1 minute.
Cut the bacon in half lengthwise. Wrap the meatballs first with the leek and then with the bacon. Heat the oil in a pan and fry the meatballs in portions for about 5 minutes, turning them over.
Rinse organic lemons with hot water, grate them dry and peel them in zests. Halve the lemons, squeeze the juice. Mix lemon juice, honey and vinegar, season to taste with salt, pepper and sugar. Wash purslane and shake dry.
Roughly pluck mozzarella and arrange on plates, arrange meatballs on top. Spread purslane and lemon zests over it, drizzle with vinaigrette and sprinkle with coarse pepper.