Possible Clues:

• Old-fashioned ingredient
• G in pink with what's not so sweet
• Herb-flavored drink
• Sounds as if Angus gets a rut back with his drink
• Sharp-tasting ales
• Angostura - - , a cocktail flavouring
• Cocktail flavoring
• An unpleasant point to swallow - with gin?
• Dry, sharp-tasting ales
• Sharp-tasting additive