Cream Tuna on Toast

Melt 3-4 T butter on medium heat, stir in 3-4 T flour until lumps are gone. Add 1 c. milk, a little at a time to smooth out lumps, then add another cup of milk (or two, depending on how thick or thin you want it). Stir in ¼- ½ t. salt. Add 1 can of Tuna.
Pour over toast.