Combine the garlic, oregano, vinegar, olive oil, adobo seasoning and salt in the bowl of a pilón or mortar and pestle, or a small food processor. Grind into a thin paste, then pour the marinade over the steak. Zip the bag then shake well to coat the meat, rubbing in gently as needed. Let rest on the counter for 10 to 20 minutes, or refrigerate overnight if you have time. Be sure to let the steak come to room temperature before grilling.
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