For the salad, place whole beans in a large sieve, rinse with cold water and drain well. Peel and finely dice the onion. Clean, wash and finely dice the peppers. Wash parsley, shake dry and chop finely.
For the vinaigrette, mix vinegar, salt, pepper, 1 pinch of sugar and chili flakes. Fold in the oil. Mix everything well and let it stand for about 1 hour. Season salad with salt, pepper and sugar.