Cook the beans in boiling salted water for about 7 minutes, drain and drain. Prepare pasta in boiling salted water according to package instructions, drain and drain. Clean, wash and cut the peppers into rings.
Peel the onion and cut into strips. Season vinegar and 2 tablespoons of water with salt, pepper and sugar, stir in oil. Mix beans, paprika, onion and noodles, pour vinaigrette over. Drain the tuna, pluck it into pieces.
Cut cress from the bed. Fold both into the salad. Arrange the salad in a bowl and sprinkle with pepper.