Add orange peels and 1/2 cup 151-proof spirit to a quart-size jar. Seal and shake—this is your orange component.

Put the cloves, caraway seeds, star anise, and anise seeds in a pint-size jar with 1/2 cup 151-proof spirit and shake—this is your spice component.

Put the gentian root and quassia chips in another pint-size jar with bourbon and shake—this is your bittering mix.

Store all 3 jars in a cool, dark place. After 10 days, strain the spiced spirits and bittering mix through a fine-mesh sieve to remove the solids. Then strain the spirits again through cheesecloth into the orange-flavoring jar—do not remove the orange zest. Seal and shake vigorously. Let this mixture steep for an additional 11 days. Strain out the orange zest through a fine-mesh sieve, then strain again through cheesecloth or a coffee filter into your desired final container. Enjoy a few drops in your favorite cocktail or mocktail.