Spiced roast roots

Name: Spiced roast roots
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Cuisine: British
Ingredients: 700g (1lb 9oz) mixed root vegetables such as sweet potatoes parsnips carrots and swede; 4 teaspoons olive oil; 1-2 teaspoons each hot chilli powder ground cumin and ground coriander; 1 clove garlic finely chopped (optional); 1 tablespoon sunflower or pumpkin seeds; Freshly ground black pepper to taste; 2-3 teaspoons chopped fresh coriander (optional)