Spiced lentil & butternut squash soup

Name: Spiced lentil & butternut squash soup
Prep time: 10 min
Cook time: 40 min
Total time: 50 min
Cuisine: Moroccan, African
Ingredients: 2 tbsp olive oil; 2 onions finely chopped; 2 garlic cloves crushed; ¼ tsp hot chilli powder; 1 tbsp ras el hanout; 1 butternut squash peeled and cut into 2cm pieces; 100g red lentils; 1l hot vegetable stock; 1 small bunch coriander leaves chopped, plus extra to serve; dukkah (see tip) and natural yogurt, to serve