Slow Cooker Vegetable Stew with Red Lentils and Pearl Barley (v)

This was my second attempt with a slow cooker and from it I learnt that potatoes do not love a slow cooker, and lentils should be placed at the bottom of the crock pot. You have been warned.

For 6 large portions you need:
1 celeriac root, diced
2 carrots, sliced
1/2 swede, diced
1 cup red lentils
1 cup pearl barley
1.5 litres vegetable stock
2 onions, diced
1 heart celery, chopped small
2 tsp dried oregano
1 tbsp vegetable oil

Begin by frying off the onion and celery in a pan. Place everything in the crock pot, starting with the barley and lentils and then adding the vegetables. Sprinkle over the herbs and add the stock. Leave on low for 8-10 hours.