Ok, this is the closest thing I could find.
Cut 10 potatoes into pieces and put them through a hand meat grinder or the equivalent electric appliance. Squeeze out the potato water after grinding.
Mix 2 cups of flour with 2 teaspoons of salt
If you wish to make them med flesk, cut up some bacon or ham into 1/2 or 3/4 inch (2 cm) pieces
Mix the flour and the potatoes together and form dumplings with a large spoon about 3 to 31/2 inches (7 to 9 cm) around (dip the spoon in boiling water every time you make a ball)
Bring a kettle of water with 2 to 3 teaspoons of salt to a boil. Boil the dumplings slowly, 45 to 60 minutes. Serve with melted bacon fat (or butter), salt and pepper.
May be served the next day fried in bacon fat.
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Your mother might have just ground them up, added the bacon however you remember i.e., cooked, not cooked, whole, or chopped. Layered everything in a casserole (salted and peppered) and cooked on low, like you said (maybe 225) for a very long time. Then the next day slice and fry.