Grilled Fish With Artichoke Caponata

Name: Grilled Fish With Artichoke Caponata
Ingredients: 1/4 cup extra-virgin olive oil, plus more for rubbing; 4 tender celery ribs, diced (1 cup); 1 onion, finely chopped; 3 garlic cloves, thinly sliced; 1/2 cup prepared tomato sauce; 1/2 cup dry white wine; 1/4 cup white wine vinegar; 1/2 pound marinated artichoke hearts, drained and chopped; 1/2 cup pitted green olives, chopped; 1/4 cup pine nuts; 3 tablespoons sugar; 2 tablespoons small capers, drained; Kosher salt and freshly ground pepper; 3 tablespoons shredded basil; Six 7-ounce skinless mahimahi fillets