An unusually versatile preparation, good as an appetizer, a side dish, or a salad, and as appropriate over lettuce as it is solo. Can be made days and days in advance.
Combine the first 3 ingredients in a bowl with a small pinch of salt and some pepper. Cover and refrigerate for at least 2 hours and up to several days, tossing occasionally.
Taste and adjust the seasoning, then garnish and serve.