Possible Clues:

• Fuss over British cook's seasoning
• Alternative source of biofuel introduced by power plant
• Vacated pub into which brought different fragrant plant
• Plant for cooking
• Plant that's cooked in separate bag initially, under lid of pan
• Vegetable used to flavour
• One of two in lead — one's used to season?
• Rosemary, maybe, is lead: different parts
• Sage perhaps makes fuss over book
• Mint or thyme, e.g