In a medium saute pan, lightly toast pecans over medium-high heat (be sure to gently shake the pan or stir the pecans to avoid burning them). Add the 4 T. butter/ghee and turn down to medium heat. Add the honey, cinnamon, cayenne, nutmeg and salt, and simmer for 4 or 5 minutes. Once the ingredients are fully incorporated, add the whiskey (it will really sizzle!) and simmer another 5 minutes. Remove the sweet potato skins and discard. Slice into ½-inch pieces.