1 tsp olive oil
1 white onion
2 cloves of garlic
2 sticks of celery
1 small bunch of fresh coriander
1 tsp turmeric
1 tsp ground cumin
80g spinach
2 medium (about 450g) sweet potatoes
6 large vine tomatoes, (about 300g), roughly chopped
320g red lentils
1 litre organic vegetable stock
4 tbsp natural or Greek yoghurt
Wholemeal bread, to serve
Serves Four