01 - 
                In a large mixing bowl, combine pineapple spears with light brown sugar, cayenne pepper, vanilla extract, and kosher salt. Toss thoroughly to ensure spears are evenly coated.
              
              
              
                02 - 
                Cover the bowl with plastic wrap. Let pineapple marinate for 30 minutes at room temperature, or refrigerate overnight for enhanced flavor. Reserve excess marinade.
              
              
              
                03 - 
                Preheat a grill pan over high heat. Lightly spray the surface with vegetable oil just prior to grilling.
              
              
              
                04 - 
                Grill marinated pineapple spears for 1 to 2 minutes per side, turning once, until distinct grill marks develop.
              
              
              
                05 - 
                While grilling, pour reserved marinade liquid into a microwave-safe bowl and heat for 90 seconds until it reduces to a thick syrup.
              
              
              
                06 - 
                Arrange grilled pineapple on a serving platter. Drizzle warm syrup over the top and serve immediately.