Grilled Tuna Steak Sandwiches. 2 medium red onions 1/4 cup olive oil, plus more if needed Salt Ground black pepper 4 slices French bread, cut into 1/4″ slices 1-1/4 to 1-1/2 lb. tuna steak, cut into 1/2″ slices 4 to 5 TB pesto …

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