Place the duck liver in the brine overnight, then rinse and cook sous-vide at 75°C for 20 minutes. Brine the veal entrecote for 1 night, rinse clean and leave to dry.
Cut the veal entrecote into thin slices, spread the cooked duck liver (heat briefly in the oven) on top and roll up tightly. Leave to set in the fridge for 3 hours.
For the gel, bring the kumquat juice to the boil with sugar, add agar and lemon juice. Cook for 3 minutes and pour into trays. After cooling, blend finely to a smooth gel. For the dressing, mix all the ingredients. For the horseradish cream, mix all the ingredients until combined.
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