On the Instant Pot, press on SAUTE – normal and heat the olive oil.
Saute the onion, carrot, and celery until softened (3-4 minutes). Add the garlic, and sauté for 30 seconds – 1 minute.
Switch off the SAUTE setting. Add the split peas, pour in the chicken stock, add the ham bone, bay leaves, season with salt and pepper.
Secure the lid and set the vent to SEALING. Select the PRESSURE COOK/MANUAL setting and set the cooking time for 15 minutes at high pressure. The Instant Pot will take around 5 minutes to come to pressure and start cooking. When the cooking program ends, allow the steam to naturally release for 10 minutes, then quickly release the rest if the steam (if any steam is left).
Carefully remove the lid, remove the ham hock from the instant pot and remove the meat from the bone then stir it back in the soup. Discard bone.
Stir in the fresh lemon juice.
Taste the soup and adjust the seasonings if needed.
Garnish with fresh chopped parsley, serve warm with wedges of lemon on the side (to squeeze in the soup).