Combine bourbon, raspberries and sugar in a small saucepan. Using a fork, mash raspberries until blended. Bring to a boil over medium-high heat. Reduce heat and simmer 5 minutes, stirring frequently. Strain.
Stir raspberry bourbon sauce, dry mustard, crushed mixed peppercorns, garlic powder, salt, smoked paprika and cayenne pepper in a small bowl until blended.
Brush both sides of steaks with bourbon raspberry mixture. Cover with plastic wrap and refrigerate at least 2 hours or overnight.
Raspberry Mango Salsa
When ready to cook steaks, first make salsa. Stir raspberries, mango, scallions, orange juice, oil, mint, salt and pepper in a small bowl until blended. Set aside.
To Cook Steaks
Heat grill or broiler. Grill steaks 6 inches from source of heat for 10 minutes, turning once or until meat thermometer reads 140°F for medium-rare. Serve with salsa.