Roughly chop the tomatoes and put them in a food processor; chop roughly but do not puree. Put in a large bowl. Do the same for the bell peppers, cucumber, onion, and serrano peppers, if using. Do one vegetable at a time. Grate in the garlic. Add salt, pepper, vinegar, lime juice, and Worcestershire Sauce. Add 3 cups tomato juice. Stir well.
Blend the remaining ¼ cup tomato juice, olive oil, and BareOrganics Milk Thistle Seed Powder until smooth. Stir into the rest of the mixture and refrigerate for at least one hour; the longer it sits, the better.