For the truffle sauce, heat the butter, add the sliced button mushrooms and finely sliced shallots and soften in the butter.
Add the chicken fond and reduce by two thirds.
Add the charcoal and truffle jus and bring to the boil.
Add the Debic Culinaire Original. Reduce by one third of the volume. Pass through a sieve.
Add the truffle scraps and leave to infuse for 20 minutes.
Blend with an immersion blender.
Pass through a fine sieve, season the sauce with salt and balance the acidity with some lemon juice.