Method

• 1.
  Line a baking tray with foil, then lightly brush with oil.
• 2.
  Place chocolate in a heatproof bowl set over a saucepan of simmering water (don’t let the bowl touch the water) and stir until melted and smooth. Pour melted chocolate over the prepared tray and set aside to cool to room temperature. Sprinkle with sanding sugar, then transfer tray to the fridge to harden. Break into shards and serve with espresso.