Ingredients

• 4 tablespoons extra-virgin olive oil
• 1 onion, cut into 1/4-inch dice
• 3 cloves garlic, thinly sliced
• 2 ribs celery, cut into 1/4-inch dice
• 1 baking potato, like russets, cut into 1/4-inch dice
• 1 teaspoon chile flakes
• 1 cup Gaeta olives
• 2 tablespoons salted capers, rinsed
• 1 pound fresh plum tomatoes, peeled and coarsely chopped
• 1/2 cup water
• 11/2 pounds bluefish fillet, skin and bones removed, cut into 4-ounce pieces
• Salt and pepper
• 1 bunch Italian parsley, chopped to yield 1/4 cup

Directions