Authentic Chinese Pepper Steak

I used to go to a fine Chinese restaurant
and liked the pepper steak so much that I
asked for the recipe, we had a great time trying
to covert the recipe written on a scrap paper
chinese to English.This is what we came up with.

Ingredients:
3 lbs. cooked roast beef
1 lb. green peppers, sliced
1 1/2 lbs. onions, sliced thin
12 oz. red pepper, sliced thin
3 oz. beef base
3 oz soy sauce
1/2 teaspoon salt
Dash white pepper
1/2 teaspoon granulated garlic
5 oz. corn starch
6 oz. cold water
3/4 gallon water
6 lbs. white rice, cooked

Directions:
Prepare beef stock by placing
pot of water on stove.
Bring water to a boil and add beef base,
salt, white pepper, soy sauce and granulated garlic.
Dissolve corn starch in 6 oz cold water
and add beef stock. Stir and simmer until thickened.
Sauté onion and bell pepper in olive oil until tender.
In a large roasting pan, place bell pepper,
sliced onions, roast beef and stock.
Put in oven for 45 minutes,
stirring often. Serve over white rice
and garnish with onion and bell peppers