We had something called sfgt on a shingle in the Navy but it wasn't very good. Sort of a bland tomato/hamburger thing on toast. Now that I'm far from the Navy...
Two of my favorite things (I'm a simple man) are creamed tuna on toast and chipped beef on toast.
My wife likes creamed eggs on toast which you make the same way except use hard boiled eggs instead of the tuna or dried beef.
Recipe for creamed tuna or chipped beef or eggs on toast.
Melt some butter in a sauce pan (maybe a 1/4 to 1/2 stick)
Add flour to absorb butter and form pea-sized flour/butter balls
Cook roux just a little...don't let it brown.
Add a couple of cups of milk (you can add more if the white sauce is too thick)
Whisk or fork while slowly heating to a slight boil
Once the sauce boils it will be as thick as it is going to get
Add tuna, dried/salted beef, peas, salmon or hard boiled eggs.
Serve on buttered toast (I like harder toast that has been dried a little in the oven).
A variation on this theme that can be good is to use leftover salmon (or canned), add peas, a little garlic powder or salt, and grated parmesean cheese. This is seriously good.