Coat beef with groundnut oil and cover with Suya spice and let marinade for a few hours or overnight in the fridge.
Heat the oven to gas mark 6/200C.
Place the macaroni in a pot and cover with boiling water. Boil for 6mins until half cooked. Drain the pasta and leave to one side.
Pour the milk into a saucepan, add stockpots and bring to a gentle boil. When boiled take off the heat.
While the milk boils, melt the butter in a pot then add flour, to make a roux. (Be careful not to overcook, add 20g more butter if roux is too thick).
Begin to gradually add the milk to the roux to make your white sauce.
Season sauce, add cheeses and let simmer, once cheese has melted gradually add pre-cooked macaroni, making sure all the macaroni is coated in the cheese sauce.
Place in dish and insert the king prawns tails up into the macaroni. Cover with the remaining cheeses.
Place in the oven 30-45mins or until golden brown. Remove the steak from the fridge to come to room temperature.
When mac n cheese is almost done heat griddle ready to grill your Suya sirloin. Once cooked slice and sprinkle with Suya and a side of the mac n cheese.