In 1-quart saucepan, heat 1 cup butter, the water and 3 tablespoons baking cocoa to boiling. Remove from heat, and pour into flour mixture. Mix to combine. Add buttermilk, baking soda, vanilla, 2 tablespoons bourbon and the eggs; mix well to combine. Fold in chopped pecans. Divide batter evenly among muffin cups, filling two-thirds full.