(Whoops, I just realised Sloppy Joes are different to our Sloppy Burgers- I love learning 'American'
I thought I'd leave it up anyway)
Here's our World Famous sloppy hamburger mix:
For every 500g mince add:
1 grated Carrot
Finely Diced Onion
1 packet french onion soup mix
1 packet chicken noodle soup mix
1/2 - 3/4 cup milk
1/2 - 3/4 cup water
1/2 - 3/4 cup flour
Squelch all together (you have to use your hands!). This makes a heap of patty mix. Just get a ladle/serving spoon, 'slop' them onto the barbie and make whatever size patties you want. They never fall apart and taste delicious.
They are better when you make them a couple of hours before cooking as the soup mix rehydrates itself a bit. I have to take copies of the recipe with me whenever we make it for a party as I'm always asked for the recipe (I can't take credit for it- the recipe comes from my FMIL)