Step 1

Mix the two envelopes of Au Jus Gravy mix with 6 cups of water in a 4 quart crock pot slow cooker.

Step 2

Cut the sirloin tip steak into strips and add to the crock pot along with the sliced onion.

Step 3

Toss well.

Step 4

Cover and cook on low for 4-6 hours.

Step 5

When done divide the tender pieces of steak between 4 toasted sub rolls, add a slice of cheese to each sandwich if desired and melt under the broiler in your oven.

Step 6

Serve with the Au Jus gravy for dipping.

Step 7

Makes 4 to 6 servings.