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["In a bowl, whisk together all of the ingredients, except the onions, Essence, and peppercorns.", "Place the steaks in a large sealable bag with the marinade.", "Seal and refrigerate for at least 12 hours, and up to 36 hours.", "Preheat a grill.", "Remove the steaks from the marinade and pat dry.", "Season both sides with 1 tablespoon of the Essence and the peppercorns.", "Pour the marinade into a small saucepan and bring to a simmer.", "Simmer until thickened and reduced by 1/3 in volume, about 5 minutes, stirring occasionally.", "Remove from the heat.", "Sprinkle the thick onion slices with the remaining 1 tablespoon of Essence.", "Grill the steaks until medium-rare, about 6 minutes per side.", "At the same time, grill the onions (as though grilling a patty, so the rings stay together) until golden and char-marked by the grill, turning once.", "Remove the steaks from the grill and top with the grilled onions.", "Serve with the reduced marinade as sauce.", "Combine all ingredients thoroughly and store in an airtight jar or container.", "Yield: about 2/3 cup", "Recipe from ""New New Orleans Cooking"