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Clean the shells: Rinse the eggshells thoroughly to remove any egg white or yolk residue.
Boil for safety: Place them in a pot of boiling water for 10 minutes to eliminate bacteria.
Dry completely: Let them air dry on a clean towel or place in a warm oven (around 200°F or 93°C) for 10–15 minutes until dry.
Grind into powder: Use a coffee grinder, blender, or mortar and pestle to crush the shells into a fine, flour-like powder.
Store: Keep the eggshell calcium in a sealed, dry container away from moisture.
Serving and Storage Tips:
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