Heirloom Tomato Gazpacho

Name: Heirloom Tomato Gazpacho
Ingredients: 5 slices stale artisan bread, (crust removed); 5 large ripe heirloom tomatoes; 2 green onions (trimmed and roughly chopped); 2 garlic cloves, (peeled and roughly chopped); 1 large cucumber, (peeled and chopped); 1 celery stalk, (chopped); 1 green pepper, (deseeded and roughly chopped); 1 lemon, (juiced); 1/2 cup water; 1/2 cup olive oil; 1 tsp. cayenne pepper, (optional); salt and pepper; sugar; 1 avocado, (peeled, pitted, and diced); crema or sour cream; fresh parsley, (chopped); chives, (chopped)