Boil the bones for 20 minutes. Strain the bones and discard the water. Wash the bones of any bone fragments. Make sure to clean out your stock pot of any leftover bone scum.
Place the bones, meat, onion, and Korean radish in a large stock pot. Cover with 12 cups of water. Bring to a boil. After 30 minutes, reduce heat to medium and simmer for 3 hours.
Remove meat and Korean radish. Let cool and place in refrigerator for later use.
Strain the stock of bones and onion into another pot. Let that stock cool, then refrigerate or put outside if winter time. Then skim all of the fat off the top.
Clean out any bone scum from your stock pot. Add the bones and onion back in. Fill with another 12 cups of water. Bring to a boil. Reduce heat to medium and let simmer for 3 hours.
One again, strain the stock of bones and onion into another pot. Let that stock cool, then refrigerate or put outside if winter time. Then skim all of the fat off the top. Add that stock to the first batch of stock. Continue to keep cool.
Clean your stock pot again of any bone scum residue. Add the bones and onion back in. Cover with 12 cups of water. Bring to a boil. Reduce heat to medium and simmer for another 3 hours. At this point, the final batch of stock will look milky in appearance.
Strain the stock of bones and the onion. Let that stock cool, then refrigerate or put outside if winter time. Then skim all of the fat off the top.
Add all 3 stocks together. Bring to a boil and simmer for 1 hour. The stock should be clear of fat and milky in color.