1tablespooncornstarch mixed with 2 tablespoon cold water
Instructions
Add a few tablespoons oil to a large skillet and brown the London broil on both sides; seasoning with salt and pepper.
Place the London broil in the crock pot, followed by the onions, garlic and beef broth.
Cook on high for 4 hours or low for six hours.
Remove the meat from the crock pot when it is tender or a small pairing knife can be inserted into the middle of the London broil without any resistance.
Cover the London broil with aluminum foil while you make the gravy.
Add the cornstarch mixture to the crock pot and continue to cook for another 15 to 20 minutes or until the broth thickens.
Slice the London broil and arrange on a serving platter.
Spoon the onions and gravy mixture on top and serve.
Notes
Prepare a "slurry" to help thicken the broth towards the end of cooking by mixing a small amount of cornstarch with some cold water.