Can I use only star anise or only anise seeds instead of both?

Expanded Explanation

Yes, but the result will change noticeably because star anise and anise seeds do not behave the same in alcohol. Star anise gives a broader, sweeter, more dramatic licorice aroma, while anise seeds are finer, drier, and more herbal. Using both creates a more layered profile, especially in a recipe that also includes coffee and brandy.

If you use only star anise, reduce the amount slightly because it can dominate quickly and make the liqueur feel heavy or medicinal. If you use only anise seeds, the result may feel lighter, drier, and less rounded, so the coffee can stand out more sharply. In that case, the palm sugar and honey become more important for smoothing the profile.

For substitution, start conservatively and taste after infusion rather than matching volume blindly. Two whole star anise can be strong enough on their own, while anise seeds alone may need a little more patience to fully show. The safest route is to keep the coffee controlled and let the spice stay aromatic, not aggressive.