Preheat
oven to 350 degrees F.
Combine
brown sugar and flour in a small bowl.
Coat
pork cubes in mustard, then in the flour mixture.
Heat
oil in a large frying pan, and brown pork cubes on all
sides.
Transfer
pork cubes to a large casserole dish. Continue until
all pork cubes are browned.
Add
onions and garlic to the frying pan and cook until softened
but not brown. Add them to the casserole dish.
Discard
any fat in the frying pan. Add the broth and sherry
to the pan, and bring to a boil. Pour into the casserole
dish.
Add
sweet potato cubes to the casserole dish. Cover and
bake for 50 to 60 minutes, until meat and sweet potatoes
are tender.
Season
with salt and pepper to taste, and add parsley. (About
8 servings.)