Sweet potato & red kidney bean hotpot

Ingredients (4 servings): 2 teaspoons olive oil 1 large brown onion, halved, coarsely chopped 1 large red capsicum (bell pepper), halved, deseeded, cut into 3cm pieces 1 garlic clove, crushed 1½ teaspoons chilli powder 1 x 400g can diced tomatoes 185ml (3/4 cup) Vegetable Stock 1 large (about 700g) sweet potato, peeled, cut into 3cm pieces…