Select your substitute based on the recipe and desired flavor — fennel fronds or dried tarragon for anise notes, chervil or dill for herbal freshness, or basil with anise extract for raw applications.
Prepare the substitute accordingly: chop fresh herbs finely; measure dried herbs or extracts precisely.
Apply the indicated substitution ratios and integrate the substitute into your recipe.
Adjust seasoning and check the flavor balance, especially when using anise extract to avoid overpowering taste.
For dried tarragon, add early in cooking to bloom flavors; for delicate herbs like chervil, add near the end or raw.