French Onion Soup Recipe

Good morning. I sliced a few pounds of yellow onions into the slow cooker the other day, then plopped a chunk of butter the size of a baby’s fist on top of them and let the whole thing burble along for the better part of an afternoon. This made a nice base for a gravy I served on top of hamburgers seasoned with mustard powder, cayenne pepper, Worcestershire sauce, salt and black pepper, a hack of a recipe I saw…