Specific steps:

Wash the pig bones.

Soak soybeans in water.

Soak kelp in advance, wash and shred.

Boil water in the pot and fly pig bones.

Add water to the pot and fly the pig bones on the water.

Put it in the sea and pour in soybeans.

Cover it and bring it to a boil.

After boiling, turn off the heat and simmer for 90 minutes.

After cooking, add salt to taste and take out the pot.