1Preheat toaster oven to 180 C.
2Mix tuna, onions, coriander, garlic, black pepper, lime juice, salt and cheese for tuna in a bowl.
3Put tuna mix on half of ciabatta and top with 2 slices of cheese.
4Put in toaster oven for 5 mins until cheese melts and ciabatta is well toasted.
5Top with iceberg lettuce and tomato. Enjoy!