Clean, wash, quarter and cut the peppers into small cubes. Clean the leek, cut lengthwise, rinse, drain and cut crosswise into thin strips. Wash and clean the cucumber, cut in half lengthwise and cut into thin slices.
Clean and wash the romaine lettuce, spin dry and pluck into bite-sized pieces. Season vinegar with salt and pepper, fold in 1/2 tablespoon of olive oil. Peel onion and cut into small cubes.
Prepare rice in boiling salted water according to package instructions. Knead onion cubes, minced meat, curd and mustard to a smooth mixture. Season to taste with salt and pepper. Form 16 balls from the minced mass.
Heat the remaining oil in a coated pan, fry the balls for about 10 minutes, turning them over. Drain the rice. Bring the stock to the boil, add the diced peppers and leek and steam in a closed pan over a low heat for about 8 minutes.
Mix peas, pizza tomatoes and rice into the vegetables, bring to the boil and season with salt and pepper. Rinse parsley, dab dry, pluck into small twigs. Mix salad, cucumber and salad dressing and arrange in portions.
Arrange vegetable rice and meatballs on plates, garnish with parsley.