That's what my mother did -- cooked a pot roast after church and it smelled up the house all afternoon. I have fond memories of that. But we hardly ever had any leftovers on Monday, with six people in the fam.
A lot of her cooking traditions came from the British emigrants' side of the family, I have discovered in my adult years.
What is a pot roast?
In Britain that would be a fairly cheap cut of meat that is put into casserole or crock pot and roasted slow for several hours to tenderise the meat. You could also add vegetable to it or just onions.