Identify how you’ll use pastis (classic water dilution, cocktail, or baking/syrup) and whether your goal is “same flavor” or “same effect.”
Choose the substitute from the list based on the anise strength you want: 1:1 for liqueur cousins, ¾:1 for typically sweeter options.
If making the classic diluted style, start with the same dilution approach you’d use for pastis (adjust from there for intensity).
Taste and calibrate: if too sweet/licorice-forward, reduce the substitute ratio; if too weak, increase slightly or add a small pinch of anise-scented sweetness.
Use right away for best aroma, especially for drinks served over ice.