When they are still warm, blend in a spice blender with 1/4 tsp. red pepper flakes until evenly ground. Add 4 ounces of high-proof rum. Blend quickly (you may lose some of the rum out of the spice blender. Just replace it in the next step.
Combine 15 oz. hot water (very hot, but not boiling) and 3/4 c. finely granulated sugar. Stir to dissolve.
Use a coffee filter in a sieve or strainer over the sugar water and let the spice/rum mixture filter through, spreading the spices to let all the water go through slowly.Transfer to a clean bottle and label. Refrigerate for up to two months, shaking with each use.
2 ounces blended Scotch
1/2 ounce Drambuie
1/2 ounce syrup
Add ice to the glass and stir 20-30 seconds. Strain into a double Old Fashioned glass with a large ice cube.
Lemon peel and garnish