Cold Heirloom Tomato Soup

Name: Cold Heirloom Tomato Soup
Ingredients: 2 teaspoons extra virgin olive oil; Chopped chives for garnish; 1 slice country-style bread; 2 pounds heirloom tomatoes; Zest and juice of 1 orange or 2 teaspoons sherry vinegar; 4 ounces lump crab meat; 1 small sweet onion or red onion, cut in eighths through the root; Ground pepper, to taste; Sea salt, to taste