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Step 1
Prick tuna steaks all over with a fork and place in shallow glass dish.
Step 2
Whisk oil, soy sauce, lemon juice, Dijon 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.
Step 3
Preheat grill for medium heat and lightly oil the grate.
Step 4
Remove tuna from the marinade. Shake excess moisture from the steaks.
Step 5
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.
Step 6
Cook tuna on preheated grill, basting with boiled marinade, until cooked through, 5 to 6 minutes per side. Serve with lemon wedges.