Combine bourbon, orange zest and juice, bitters, Worcestershire, brown sugar, water, peppercorns and 2 teaspoons salt in a saucepan; bring to a simmer stirring occasionally. Reduce marinade by half over medium-low heat.

Cool marinade completely (below 40°F). Pour into a 1-gallon zipper-locking plastic bag along with t-bone steaks. Marinate 2 – 4 hours, flipping once.

Preheat grill to medium high. Grill steaks about 5 minutes per side for medium rare (125-130°F internal temperature) or until desired doneness is reached. Allow steaks to rest 5 minutes, sprinkle with additional salt and serve.