Manhattan Crab Chowder

Name: Manhattan Crab Chowder
Ingredients: 2 cups precooked diced potatoes, (see Tip); 1 14-ounce can reduced-sodium chicken broth, or vegetable broth; 1 cup finely diced onion; 1 cup cored fennel bulb, finely diced, plus 2 tablespoons chopped fronds, divided; 1 pound pasteurized crabmeat, drained if necessary; 1 1/2 cups water; 2 tablespoons extra-virgin olive oil; 1/8 teaspoon salt; 1/2 teaspoon freshly ground pepper; 2 cups canned crushed tomatoes; 2 teaspoons Italian seasoning blend; 2 tablespoons minced garlic