2 tablespoons extra-virgin olive oil
1 cup finely diced onion
1 cup finely diced cored fennel bulb, plus 2 tablespoons chopped fronds, divided
2 tablespoons minced garlic
2 teaspoons Italian seasoning blend
1/8 teaspoon salt
1/2 teaspoon freshly ground pepper
1 14-ounce can reduced-sodium chicken broth or vegetable broth
1 1/2 cups water
2 cups precooked diced potatoes (see Tip)
2 cups canned crushed tomatoes
1 pound pasteurized crabmeat, drained if necessary
Heat oil in a large saucepan over medium heat. Add onion, fennel bulb, garlic, Italian seasoning, salt and pepper and cook, stirring often, until the vegetables are just starting to brown, 6 to 8 minutes.
Add broth, water and potatoes; bring to a boil. Reduce heat to a simmer and cook until the vegetables are tender, 3 to 5 minutes. Stir in tomatoes, crab and fennel fronds. Return to a boil, stirring often; immediately remove from heat.