Prick tuna steaks all over with a fork and place in a shallow dish.
STEP 2
Mix all other ingredients together and pour over steaks. Cover and put in fridge for 1 to 3 hours.
STEP 3
Remove tuna from the marinade. Shake excess moisture from the steaks. Pre-heat oiled griddle pan.
STEP 4
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 5
Cook tuna on preheated griddle pan, basting with boiled marinade, until cooked through, 5 to 6 minutes per side. Serve with lemon wedges if required and salad and/or couscous.