Pre heat the oven to 325 degrees. In a medium saucepan combine the maple syrup, bourbon, water, salt and cayenne pepper. Bring to a boil. Reduce heat to a simmer and simmer for 15 minutes and then turn off the heat. Add the pecans and let them sit in the brine for 30 minutes. Remove the pecans to a parchment lined sheetpan. Roast the pecans for 15 minutes or until dry and lightly browned.