Clean and wash the green beans, cut them diagonally into pieces and cook in salted water for about 10 minutes until firm to the bite. In the meantime cut Pancetta into fine strips. Chop the tomatoes. Whisk vinegar and oil. Add tomatoes and pancetta. Season with salt, pepper and 1 pinch of sugar.
Wash thyme, shake dry and pluck leaves from the stalks. Fold into the vinaigrette. Peel onions and cut into fine slices. Drain the broad beans and let them drain well. Mix all ingredients together and season again with salt and pepper