Possible Clues:

• Relish is French with zero added
• Citrus peel shavings
• Grated citrus part
• Dynamism
• Last letter in French is showing enthusiasm
• Lemon drop martini garnish
• ___ for life (high spirits)
• Outer part of citrus fruit peel
• Enthusiasm shown during quizzes there
• Shavings in marmalade