let the mixture drip through to a clean bowlâ€”this can take up to 24 hours. Change the lter when it becomes clogged with the residue from the liqueur. I repeat this step once or twice more after all the liqueur has passed through to clarify it as much as possible. 4. Pour the liqueur into a decanter with a tight- tting top. It will keep at room temperature for up to 6 months.