Peel tomatoes if desired, and remove as many seeds as you can. Don’t make it too difficult! A few seeds are fine.
Puree ingredients, except salt, pepper and vinegar, in several batches in a blender or food processor. Mix all batches together in a large bowl or pitcher and taste to adjust seasoning.
Chill until very cold, then serve with an optional garnish of finely diced onion, pepper and cucumber.
Easy-Peel Tomatoes: cut a small X in the bottom of each tomato. Carefully place in boiling water and allow to simmer for about a minute. Immediately plunge into ice water, then peel skins off.