aniser

A narrow, technical culinary verb meaning to flavor something with anise or aniseed (aniser une pâtisserie, une liqueur) — encountered almost exclusively in cooking and confectionery contexts, never in everyday conversation.

• Le pâtissier a anisé la pâte avant de la cuire. — The pastry chef flavored the dough with anise before baking it.
• Cette liqueur est anisée, comme le pastis. — This liqueur is anise-flavored, like pastis.
• On anise parfois le pain d'épices avec de la badiane. — Gingerbread is sometimes flavored with anise using star anise.

Learners sometimes confuse aniser (to flavor with anise) with the adjective anisé(e), which is far more common in everyday speech (une boisson anisée) — the verb itself is rarely used outside professional recipes.