Peel the apple, remove the seed core, and cut it into small cubes. Cut the rhubarb into pieces approximately 2 cm long. Finely chop the chocolate. Mix the flour with the baking powder and soda.

Other seasonal fruit could be substituted for the rhubarb in this versatile recipe. Try raspberries in the summer, or just apples in the autumn. Preheat the oven to 180C/350F/Gas 4. Line 12 muffin ...