Possible Clues:

• Hard seed of tropical tree used as spice
• Spice Girl's foremost fan - me, at first
• Applesauce topper, perhaps
• Pumpkin pie ingredient
• Hard seed of tropical tree grated for spice
• Tropical tree seed ground as spice
• Spice in container rejected by Margaret
• Valuable stone barrel's taken up with this tree
• Aromatic seed - tropical tree
• Margaret is dotty but sounds greater