Snert (Dutch Split Pea Soup)

Step 1
Place gammon in a large pot; cover with cold water and bring to a boil. Add split peas and pork belly; simmer for 10 minutes. Skim off any foam that rises to the surface of the water.

Step 2
Transfer gammon and pork belly to a plate using a slotted spoon. Strain split peas through a sieve, discarding water.

Step 3
Place gammon, split peas, and pork belly back into the pot; cover with fresh water. Bring to a boil; reduce heat and simmer gently until gammon and pork belly are tender, 2 to 3 hours.

Step 4
Transfer gammon and pork belly to a plate using a slotted spoon; cool until easily handled, about 10 minutes. Remove gammon from the bone and slice. Slice the meatiest parts off the pork belly.

Step 5
Stir the chopped meat back into the pot. Add celeriac, leeks, onions, and carrot; simmer until softened, about 15 minutes. Add whole sausage link; simmer until heated through, 10 to 15 minutes. Remove sausage link and slice into small pieces; stir back into the soup.

Step 6
Sprinkle celery leaves, salt, and pepper over soup. Simmer until celery leaves are warmed through, 1 to 2 minutes.