Line a baking tray with non-stick baking paper. Place butter, cheese, flour and salt in a food processor and run the machine until the pastry clumps around the blade. Gather the pastry in a ball and dunk in flour to coat. Pinch off pieces of pastry, press out into a disc and wrap around a dried caperberry to enclose. Place on the prepared tray and freeze until the pastry is quite hard, about 10 mins. Pre-heat oven to 180°C. Bake the chilled caperberries for about 15 – 20mins, checking and turning to evenly bake a golden brown. Serve warmed. This pastry can also coat pitted and stuffed olives or pieces of cheese etc.