Shio Koji Barbecued Duck Hearts with Horseradish

• 4 duck hearts
• 1 tablespoon shio koji (fermented rice)
• fleur de sel
• 3

Trim the duck hearts of any fat and sinew. Put them in a sous-vide bag or resealable plastic bag with the shio koji and leave to marinate overnight.

Heat a barbecue or chargrill to high. When it is very hot, grill the duck hearts for 1 minute on each side. Remove from the heat and rest for 2 minutes. Cut each heart evenly in half, season lightly with fleur de sel then, using a microplan