1.Preheat oven to 200°C (180°C fan forced). Grease oven trays.
2.Sift flour and caster sugar into medium bowl, rub in butter. Stir in craisins, coconut, chocolate, egg, milk and extract. Do not over-mix.
3.Drop heaped tablespoons of mixture about 5cm (2 inches) apart onto trays, sprinkle with demerara sugar.
4.Bake rock cakes about 15 minutes. Cool on trays.