step 1
Soak the yellow split peas for 12 hours in cold water.
step 2
Rinse the split peas, put in a large pan and cover with the stock. Bring to the boil and simmer for 25 mins.
step 3
Remove any scum and add the onion, sweet potato and carrots. Simmer for 15-20 minutes, until the veg are tender.
step 4
Cool slightly, then blend until smooth.
step 5
Return to the pan and reheat, adding the spinach to wilt it.