In a mixing bowl, whisk together soy sauce, olive oil, lemon juice, garlic, brown sugar, and black pepper.
Place the steak tips in a resealable plastic bag or shallow dish. Pour the marinade over the steak tips, ensuring they are well coated. Seal the bag or cover the dish and refrigerate for at least 2 hours, or overnight for best results.
Preheat your grill or skillet to medium-high heat. Remove the steak tips from the marinade and discard the marinade.
Grill or cook the steak tips for about 4-5 minutes per side, or until they reach your desired level of doneness.
Let the steak tips rest for a few minutes before serving. Enjoy!