Roasted Broccoli and Potato Curry
450 g potato, peeled and cut into 1-inch (2.5cm) dice670 g broccoli florets, cut into bite-sized pieces4 tbsp vegetable oil1 tbsp garam masala, plus ½ teaspoon for extra seasoning1 tsp salt125 g onion, cut into ¼-inch (6mm) dice3 garlic cloves,...