Dissolve Starbucks VIA in the warm water. You can also use 3/4 cup strong brewed coffee or the equivalent amount of instant coffee used for an 8-oz. cup mixed with 3/4 cup water.
Whisk together the VIA mixture, balsamic vinegar, olive oil, brown sugar, garlic, peppercorns and salt.
Lay steaks out flat in a rimmed dish and pour marinade over top. Cover and refrigerate.
Allow steaks to marinate for as little as one hour or up to 8 hours, turning occasionally.
Grill steaks as usual.
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