The title on the recipe card says "Barbecue Hamburger (Sloppy Joes)" with the name "Mrs. Mosman, Sr." at the top. Of all the names I've come across in the recipe box, this is one of the few that I don't recognize.
1 pound hamburger
1/2 cup celery, chopped
1 small onion, chopped
2 Tbsp brown sugar
2 Tbsp vinegar
1 Tbsp "catsup"
2 tsp Worcestershire sauce
1 can tomato sauce
Salt and pepper to taste
Brown hamburger. Add other ingredients and "simmer until celery is done."
Note says "add green pepper & garlic if desired."
The other day I checked out The Pioneer Woman Cooks: Food From My Frontier. There's a recipe for Sloppy Joes that is very similar to Grandma's recipe except it uses more spice, which I think would kick it up a notch and I will try next time. Things I'll add are garlic, red pepper flakes, and maybe some cayenne pepper. Also, per my mom's recommendation from how she used to make this recipe, next time I make this I'll toast or grill the buns.
In the end, I've decided this recipe is a keeper.