My sister begs me to make this for family gatherings. It is sweet, savory, and uses only 4 ingredients

reheat nicely in a covered skillet over low heat with a splash of water.

Honey mustard pork leftovers made into a sandwich
Honey mustard pork leftovers made into a sandwich

This same 4-ingredient method also works with a smaller 2 lb roast—just reduce the salt slightly and start checking for doneness about an hour earlier. If your slow cooker tends to run hot, aim for the lower end of the cook time range to keep the pork juicy instead of dry.