1 small head of cauliflower, cut into small florets
陆 chilli, finely chopped, plus extra if desired
few sprigs fresh coriander, leaves and stalks separated and both finely chopped (about 1 pinch stalks, 2 pinches leaves, or to taste)
3 medium鈥搇arge floury potatoes (about 500g/1lb 2oz in weight), peeled and chopped into bite-sized pieces
2 large garlic cloves, crushed
4cm/1陆in piece fresh root ginger, peeled and finely grated
1 large brown onion, finely chopped
2 tsp cumin seeds
1陆 tsp garam masala
2 tsp sea salt, plus extra if desired
1 star anise
1 tsp turmeric
1 tbsp vegetable oil
50g/1戮oz unsalted butter