How to cook frugally for one-#1

Cooking frugally for one: invite friends for dinner, fix large pot roast, plenty potatoes, carrots, and plenty of gravy. Utilizing a large roast allows for two or three meals for ourself later in the week. Slice some of the roast and heat in some gravy for open-face hot-roast beef sandwich; serve with left-over potatoes mashed, and some green peas.