African Vegetable Stew with Sweet Potato and Peanuts

Ingredients (4 servings): 2 teaspoons olive oil 1 large brown onion, thinly sliced 2 celery sticks, finely chopped 1 large carrot, peeled, finely chopped 2 garlic cloves, crushed 1 tablespoon curry powder 800g sweet potato, peeled, cut into 2cm pieces 400g can no-added-salt diced tomatoes 250ml (1 cup) water 185ml (¾ cup) light coconut milk…