Submitted by NancyCarol
2 teaspoons instant beef bouillon or 2 beef cubes
1 teaspoon chili powder
1 teaspoon onion salt
1 teaspoon garlic salt
1 teaspoon ground oregano
6-8 pounds cooked, sliced roast beef or your choice of beef
Bring all ingredients to a boil. Simmer 15 minutes. Pour into a crock pot and add sliced beef. Heat to serving temperature. Serve on buns.