Chipotle Gazpacho

Name: Chipotle Gazpacho
Ingredients: 2 slices red or white onion; 2 pounds ripe tomatoes; 2 to 3 garlic cloves, to taste; 1/4 cup extra virgin olive oil; 1 to 2 tablespoons sherry vinegar or wine vinegar (to taste), plus a little extra for the onion; 1 to 2 canned chipotles in adobo (to taste); 1/2 to 1 cup ice water, depending on how thick you want your soup to be; Salt to taste; 1 avocado, cut in small dice; 1/2 cup cucumber, cut in fine dice; Torn or slivered fresh basil or chopped cilantro