In a medium-sized bowl, mix together the soy sauce, sugar, apple cider vinegar, pineapple juice, garlic, and ginger. Stir until all ingredients are thoroughly combined.
Place the ribeye steak in a shallow dish or zip-top bag that is large enough to hold both steaks. Pour the marinade over the steak and work it in with your hands so that all sides of the steak are evenly coated.
Cover the dish or bag and place it in the refrigerator for at least 4 hours, or overnight if desired. The longer you marinate, the more flavorful the steak will be.
When ready to cook, preheat the oven to 350°F. Place the steak on a baking sheet and pour any remaining marinade over the top of it. Bake for 25-30 minutes, or until desired doneness is reached.
Let the steak rest for 10 minutes before slicing and serving.