Wash the savory and tie up. Clean, wash and halve the beans. Cook everything in boiling salted water for about 15 minutes. Drain the beans well. Remove savory
Meanwhile peel the onion and dice it roughly. Whip vinegar, salt, pepper, sugar and oil. Add onion. Mix the marinade with the warm beans. Leave to soak for at least 2 hours
Wash and coarsely dice the tomatoes. Wash the chives and cut into small rolls. Mix with the tomatoes and the beans. Season to taste