Clean the tilapia with some water mixed with lemon or lime juice. See note 1.
Score all the tilapia, twice on each side.
Blend all the ingredients for the marinade.
Spread the marinade all over the fish making sure to get some of the marniade into the stomach area, the bit around the head and the scores.
Leave to marinate for at least 2 hours but ideally overnight in the fridge.
Using a brush or a small piece of paper towel, brush the fish grill baskets with some oil. Brush the grill with some oil as well.
Place the fish into the grill baskets and secure them so that they don't fall out. See note 2.
Leave to come to room temperature and then grill over a moderately hot grill.
Grill the tilapia over the charcoal making sure to turn regularly so that the fish cooks evenly. The fish is ready once it flakes off easily and is no longer opaque. See note 3.
Leave the fish to cool before taking them out of the fish baskets. See note 4.
Serve with banku, rice, akple, attieke, fried yam, or kenkey and shito or fresh ground pepper.