Warming cauliflower and lentil dal

Name: Warming cauliflower and lentil dal
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: Indian
Ingredients: Low calorie cooking spray or spray oil; 1 onion, diced; 1 large garlic clove, crushed; 15g fresh coriander, finely chopped; 1/2 cauliflower, pulled apart into bitesize chunks; 200g green beans, topped and tailed; salt & pepper; 1 tbsp curry powder; 1 tbsp tomato puree; 1 tin chopped tomatoes; 100 g red split lentils; 250g 0% fat Greek yoghurt; 1 vegetable stock cube/pot; 200 ml water