Spanish Gazpacho
1 clove garlic 1 cucumber, chopped 1 cucumber, peeled and sliced 1 green bell pepper, chopped 1 green bell pepper, sliced 1 ½ tablespoons red wine vinegar 2 pounds tomatoes, peeled and halved salt to taste ¼ cup cold water, or as needed ¼ cup extra-virgin olive oil ½ onion, chopped ½ onion, sliced