Vegetable curry with cauliflower couscous

Name: Vegetable curry with cauliflower couscous
Prep time: 20 min
Cook time: 45 min
Total time: 45 min
Yield: 6 portions
Ingredients: 600 g cauliflower; 2 tsp cumin seeds; 3 tsp coriander seeds; ½ - 1 tsp black peppercorns; 1 tsp chilli powder; ¼ tsp ground turmeric; 3 garlic cloves; 200 g brown onion; 30 g vegetable oil; 400 g coconut milk; 130 g water; 500 g sweet potato; 500 g Kent pumpkin; ½ tsp sea salt; 50 g roasted unsalted cashew nuts; 100 g broccolini; 50 g snow peas; 80 g fresh baby spinach leaves; ground black pepper; 150 g natural yoghurt; 4 sprigs fresh coriander