Combine garlic, thyme and pepper; press onto beef steaks. Season with salt.
Place steaks on grill over medium and grill, uncovered, 13 to 15 minutes for medium rare to medium doneness, turning occasionally. Or to broil, place steaks on rack in broiler pan so surface of beef is 2" to 3" from heat. Broil 13 to 16 minutes for medium-rare-to-medium doneness, turning once.
Mix horseradish cream ingredients and serve on steaks.