Family Favorite Beef Roast

This didn't come from my family, but another family of good cooks.  Thanks to my friend Stephanie Taylor for passing this one on.

3 – 4 lb. beef chuck or blade roast

Large onion

Carrots (as many as you want)

Sauce:

2 T. flour

4 T. brown sugar

2 T. Dijon mustard

1 T. Worcestershire sauce

1 C. ketchup

Mix sauce together and set aside.  Slice onion and cut carrots on the diagonal into large chunks (about 1 ½” in length).  Put thick aluminum foil in pan (may need two to overlap).  Put beef on foil.  Put onion and carrots on top.  Pour sauce over everything.  Seal foil.  Cook for 4 hrs at 350 degrees.  You can also do this in a crock pot on medium for 3 – 4 hours.  Potatoes can be added in the last hour.