My dad bbq'd steaks (from bison!) for Mother's Day dinner last weekend. mmm.. They were so good. He said that Mom marinated the steak ahead of time. She used something similar to this recipe. The meat was just fork-tender.
adapted from: Dad/Mom & http://allrecipes.com/recipe/best-steak-marinade-in-existence/
1/3 cup soy sauce
1/2 cup oil
1/3 cup lemon juiee
1/4 cup Worcestershire saue
1 1/2 T garlic powder
Marinate steak up to 8 hours in the fridge.