Classic Andalusian Gazpacho

Name: Classic Andalusian Gazpacho
Ingredients: 1 (2-inch-long) piece baguette, crust discarded; 2 garlic cloves; 2 teaspoons salt; 2 tablespoons Sherry vinegar (preferably reserva), or to taste; 1 teaspoon sugar; 1/2 teaspoon ground cumin (optional); 2 1/2 lb ripe tomatoes, cored and quartered; 1/2 cup mild extra-virgin olive oil (preferably Andalusian hojiblanca); Garnish: finely chopped red and green bell peppers