Whisk together the water, whiskey, pineapple juice, brown sugar, diced onion, teriyaki sauce, soy sauce, liquid smoke, and minced garlic in a bowl.
Lie the steaks in the bottom of a baking dish. Pour the marinade over the steaks; refrigerate overnight.
Preheat an outdoor grill for high heat, and lightly oil grate.
Grill steaks to desired doneness, 3 to 5 minutes per side for medium-rare. Allow steaks to rest for 5 to 10 minutes before serving.
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