Possible Clues:

• Ten to fifty in first class to Mayo
• Is it superb with oil mixed in?
• Lilo Ian carries back that's used for a dip?
• Garlicky sub spread
• Bouillabaisse condiment
• Garlic-flavored spread
• Fancy mayo
• Alternative to tartar sauce
• Pungent fish topper
• Sauce commonly served with seafood