To make Tuna Fish Cakes, start by draining the canned tuna.
While the rice is cooking, prepare the eel by grilling or frying it.
Put the tomato paste, olives, and butter into a blender or food processor and whizz until smooth.
Put the oats in the blender or food processor, slightly broken up.
Coat the fillets with the butter mixture while grilling.
Heat a large skillet over medium-high heat and add the fish cakes.
Serving Suggestions: Some people serve this like a lime and chilli avocado wrap, with a side of chips or a salad. While others like to serve this at a BBQ, or in a sandwich, or on a wrap.
A lot of people use this in a wrap because the flavour of this combines well into the wrap. Or, you can use wholemeal bread to make a sandwich out of it.