Heat a teaspoon of olive oil in small pan and gently cook a small chopped leek and 200g peeled and diced sweet potato (standard potato if you prefer is fine). After five minutes, stir in a peeled and diced apple and 300ml of vegetable stock. Sprinkle in a little ground coriander and a dash of Tabasco sauce or pinch of chilli powder and a pinch of ground cinnamon. Cook for a further five minutes and pour into a bowl to serve.