Constantly run cold water over the bone marrow for 1 hour to help flush out any residual blood. Soak the bone marrow in the milk in a refrigerator overnight.
Remove the bone marrow from the milk and rinse well in cold water.
Set up a cold smoking apparatus with the maple wood chips and cold smoke the bone marrow for 1 hour.
Put the bone marrow in a heavy-based saucepan with the cold water and slowly and gently render over low heat until it is completely dissolved in the water. Strain and refrigerate until required.
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