This is Little Princesses' favorite:
Category: Beef|Korean|World Cuisine
Yield: 4 servings
4tbs. soy sauce
2tsp. sesame oil
1/2tsp. black pepper
1 1/2 pounds sirloin tips or strips
Mix the marinade ingredients (all but the beef) and add to the meat. Cover & marinade at least 2 hours. I recommend overnight. Pour mixture in crock pot, make extra batch of marinade & add extra marinade in crock pot. Cook on low for 6-8 hours.
I find some meats cook up rubbery in the crock pot....sirloin strip have worked well in the crock pot. For large group I buy a roast & have it shaved...they hate doing it at the grocery store, but will if you give them notice. I have used eye of the round roasts & bottom of the round roasts...if it's shaved it comes out great in the crock pot. I pretty much experiment with different cuts of meat, to see what works best I hope this helps.