Combine wine, oil, shallots, garlic, 2 teaspoons mustard, Worcestershire sauce, 1 tablespoon peppercorns, thyme and salt into a blender or food processor and mix well. Transfer to a glass baking dish or large Ziploc bag and add steaks, turning several times so they are well coated. Refrigerate 4 hours or overnight, turning several times.
Remove steaks from marinade and pat dry. Spread a thin layer of remaining mustard over one side of each steak and add place on grill, mustard-side down. Brush remaining mustard mixture over exposed side and grill, turning once, until cooked as desired, 8 to 12 minutes total for medium-rare. Check temperature with BULL Reusable Steak Button Set to make sure it is within desired range.
Recipe by Grilling Outdoor Recipes powered by Bull Outdoor Products at https://blog.bullbbq.com/recipe-of-the-week-peppercorn-mustard-encrusted-ribeye-4/