Tuna Melt With Cheese

Ingredients for 2 large tuna melts:
2 thick slices of Italian or French bread
2 tbsp soft butter
6.5 oz jar tuna, drained
1 tbsp minced green onion
1 tsp hot chili sauce or other hot stuff to taste salt and pepper to taste
2 tbsp mayonnaise, or more to taste about 1/3 cup shredded or crumbled fresh moi 1/4 cup shredded sharp cheddar cheese cayenne to taste