Marinate the Onion: Place the chopped red onion in a small bowl, squeeze a little lemon juice over it, and let it sit while you prepare the remaining ingredients. This helps take some of the sharp edge off the raw onion. Combine the Ingredients: Add the drained, un-rinsed white beans, marinated onion, 2 teaspoons wine vinegar, 1 tablespoon extra virgin olive oil, and Herbs de Provence or the fresh herb combination to a serving dish.
Season the Salad: Add salt and freshly ground black pepper to taste, then gently mix the ingredients until the beans and seasonings are evenly combined.
Serve or Chill: Serve the salad immediately, or refrigerate it for a few hours to allow the flavors to come together more fully.
Store Leftovers: Keep any remaining salad refrigerated; it will last for a couple of days.