Wash split peas and place in a 2-litre capacity bowl with 1-litre of water.
Cover and allow the split peas to soak for 8 hours or overnight.
Remove rind from ham hock and discard.
Cut meat away from the bone and roughly chop. Reserve bone.
Drain split peas and place into a 5-litre capacity microwave safe dish.
Add ham bone, chopped ham, onion, thyme, bay leaf and chicken stock.
Cook uncovered on P10 for 15 minutes.
Reduce power to P6 and cook for 15 minutes.
Skim top of soup and cook on P6 for a further 30 minutes.
Remove ham bone and bay leaf and stir in frozen peas.
Cook on P6 for 10 minutes.
Blend half the soup and return to the bowl, stirring through the remaining soup.
Serve hot with crusty bread.