DIRECTIONS
Prick tuna steaks all over with a fork and place in a shallow glass dish.
Whisk oil, soy sauce, lemon juice, mustard, lemon peel and garlic together in a bowl; pour over the tuna steaks.
Cover dish with plastic wrap and refrigerate 1 to 3 hours.
Heat grill for medium heat and lightly oil grate.
Remove steaks from the marinade.
Shake excess marinade from the tuna steaks.
Pour the marinade into a small saucepan and bring to a boil.
Reduce heat to medium-low and cook marinade at a simmer for 10 minutes.
Cook tuna on preheated grill, basting with boiled marinade, until cooked through, 5 to 6 minutes per side.
Serve with lemon wedges.
Serves 4.