Things You'll Need:
- Fist-size, smooth rock
- Bleach
- Boiling water
- Plastic cling wrap
- Heavy wooden bowl
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Step 1
Wash the rock in hot water, paying attention to any nooks and crannies where dirt or other debris may be lodged.
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Step 2
Pour bleach over the rock to disinfect. Leave the wet bleach on the rock for 10 minutes.
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Step 3
Rinse the rock thoroughly with boiling water.
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Step 4
Allow the rock to cool.
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Step 5
Wrap the rock tightly in plastic cling wrap. This will prevent food particles from being ground into small cracks and pits in the rock's surface.
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Step 6
Line a plastic bowl with additional plastic cling wrap. This step may be omitted if only dry ingredients are being crushed. Moist ingredients, such as garlic cloves, may leave odors behind when ground directly into the bowl.
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Step 7
Use the plastic-covered rock as a pestle to crush your ingredients in the wooden bowl.
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Step 8
Discard the used plastic wrap.










