Possible Clues:

• Flavouring plant
• Strong-tasting onion-like plant, bad for vampires
• If the fish were to give tongue, by the sound of it, it would make it quite a stinker
• Pesto seasoning
• Pungent root.
• With the purpose of getting knotted a number of years ago
• Lochnagar licensees supply bloodsucker repellent
• With the fish, use what's tasty - and smelly
• One might a taste from the tongue of a fish, by the sound of it
• Pungent bulb feared by vampires