In a medium bowl, combine soy sauce, olive oil, apple juice, ground celery seed, lemon pepper, Cajun seasoning, maple syrup or sugar, black pepper, and salt.

Mix all the ingredients together until well combined.

Place steaks in a shallow dish or resealable plastic bag.

Pour the marinade over the steaks, ensuring they are evenly coated.

Cover the dish or seal the bag, and refrigerate for at least 4 hours, or overnight for best flavor.

When ready to cook, remove the steaks from the marinade and discard any excess marinade.

Grill the steaks to your desired level of doneness.