Put the vinegar, olive oil and garlic, plus seasoning, into a serving bowl and whisk together.
Pat the beans dry with a tea towel and season. If you can leave the beans for a little while pour on the dressing , cover with cling film and leave for a few hours Otherwise just add the rest of the ingredients. Toss everything very gently so as not to break up the beans or crush the tomatoes.
Before serving taste the salad and add whatever you think is missing. You might want more parsley, salt or lemon juice.