Brown meat on all sides in a heavy fry pan or dutch oven, add onion.
Combine mustard, paprika, brown sugar & salt.
Combine worcestershire sauce, vinegar, ketchup; add to mustard mixture; add to meat.
Add one cup of water, stir & cover.
Cook over low heat 2 1/2 hours or until the meat is very tender.
Blend the flour with 1/2 C. water;add to meat mixture; stir until thickened.
Boil noodles in salted water according to package directions, drain.
Serve meat mixture over noodles.
Note: Jane makes twice the amount of sauce, so you would need to double all the ingredients.