Quinoa, Pearl Barley and Celeriac Slow Cooker Stew (v)

This is another ridiculously easy one pot meal. If you are sans slow cooker then make it up and cook slowly for 45 mins or so instead.

For 4-6 people you need:
1 onion, chopped
1 tbsp olive oil
1/2 cup quinoa
1/2 cup pearl barley
1-1.5 litres stock (use a little more if cooking on the stove)
1 celeriac, diced into 1cm cubes
3-4 carrots, peeled and thickly sliced

Fry off the onions in the oil for 5 mins or so. Add everything else to the slow cooker and cook on low for 6-8 hours. Serve with mash.