Ingredients:
3 pounds Skirt steak
⅓ cup olive oil
¼ cup soy sauce
1 lime or lemon (juiced)
2 tablespoon orange juice (freshly squeezed)
2 tablespoon red wine vinegar
½ cup onion (diced)
¼ cup cilantro (chopped)
4 cloves garlic (crushed)
1 Serrano pepper (diced)
2 teaspoon salt
2 teaspoon chili powder
1 teaspoon black pepper
1 teaspoon crushed red pepper flakes (optional)