Preheat oven to 200 degree C.
1. Open a canned tuna and drain them.
2. Heat a skillet on the stove. Add in a small pieces of butter.
3. When butter melts, put tuna fish in. Sauce a bit.
4. Pour in a can of pasta sauce. Turn to low heat. Keep stirring at the same time.
5. When the sauce becomes very condensed, put cooked spaghetti in it. Mix spaghetti with sauce very well.
6. Turn off the stove and sprinkle cheese over it.
7. Put skillet in the oven and bake for 5-10 mins or till cheese melts.