Pre heat grill (broiler) to a high setting
Crack eggs into a bowl and whisk
Heat the butter in a frying pan and fry the spring onion and garlic, over a medium-low heat, until softened. (around 5 minutes) Add the tuna and stir.
Turn the heat up and pour the eggs over the tuna and onions.
Allow the bottom to cook (2 -3 minutes) and then transfer to the grill (broiler) until the egg is cooked through. (around 2-3 mins)
Slice and serve.