1. In bowl, combine oil, salt, pepper and rosemary sprigs. Add beef; toss to coat. Refrigerate for at least one hour or overnight.
2. Skewer one cube of beef onto stick or skewer. Over campfire or grill heated to high, cook beef, turning, to desired doneness. Meanwhile, in pan over coals or grill, heat cheddar, stirring frequently, until completely melted.
3. Assembly: Spread melted cheese onto one cracker, top with cooked beef cube and sandwich with another cracker.

Special Equipment: Marshmallow roasting sticks or pre-soaked bamboo skewers   Hands on time: 20 minutes Total Time:  1 hour 20 minutes Makes: approximately 35 servings