Core tomatoes, then cut a small "X" at the bottom. Drop tomatoes into a pot of boiling water for 15 seconds. Remove, let cool for a minute, then peel off the skins. Dice tomatoes.
Roughly chop remaining veggies, then toss in a large bowl along with oil, vinegar, lemon juice, salt, and pepper.
Transfer small batches to a blender or food processor and blend until mixture is a coarse liquid. Transfer to a bowl and add tomato juice. Chill in refrigerator for 2 hours.
Serve in hollowed out bell peppers.