Creamed Tuna Over Toast

INGREDIENTS:

1 can of tuna fish
2 T of butter
2 T of flour
2 cups of milk
Bread (toast)
Salt

INSTRUCTIONS:

Melt the butter then add flour and make a roux.
Slowly add milk while whisking. 
(DON'T add more milk until what you are already working with is thickening)
Once thick, add tuna fish. 
Serve over toast. Salt to taste.