This is one my mom found years and years ago - it's the only sloppy joe recipe I've ever known.
It calls for 1 pound ground beef - I always use 2 because we don't like it real spicy....
2 lbs ground beef
1/2 cup finely chopped onion (optional)
1/2 cup finely chopped green pepper (optional)
1 bottle Bennet's chili sauce (or any brand chili sauce)
SECRET INGREDIENT 1 can Campbell's Chicken Gumbo Soup
Brown 2 pounds ground beef...
IF you want... add some finely chopped green pepper and onion (about 1/2 cup each) I usually leave it out.. for speed.. laugh..
Drain the meat
Once the meat is browned and drained add the bottle Bennet's Chili Sauce to the meat in the pan (Bennet's is the best .. but I can't seem to find it anymore - so I've just switched to the store brand.. same flavor..).
Fill the bottle back up with water - put the top on and shake HARD to get the residual Chili Sauce and pour into pan.
Add Chicken Gumbo soup - if it seems VERY dry.. fill the can up with soup and add that...
Cook it down until it's the consistency you'd like.
I feed tons of teenage boys with this all the time. The two pounds easily make 8 - 10... more if you go light on the mix on the bun.
My mom has made this in HUGE batches and has sold them at a dog show as a fundraiser for our dog club. (They were VERY popular...

) She basically got all her meat browned... then would make up big batches in a LARGE pot.. and kept it warm in a Nesco roaster. For 30 .. I'd probably cook up 6 - 8 pounds of meat ( 3-4 bottles chili sauce, 3-4 cans chicken gumbo soup) - and serve with salad's and chips.