x minutes + cooling
Break up the chocolate and set in bowl over a pan of simmering water and add the nut butter. Melt together until silky smooth.
Pour into silicone moulds or one large lined container and sprinkle over the chopped nuts and a tiny pinch of salt, if you like. Allow to set in the fridge for 2 hours.
Slice into bites or remove from the mini moulds. Store in the fridge.