Christmas Fillet of Lamb - Icelandic Lamb

Ingredients

• 1 saddle of lamb (tenderized for at least 5 days)
• salt and ground pepper
• olive oil and butter
• dried blueberries
• dried blueberry heather
• dried wild thyme
• wild juniper berries
• 2 pieces celeriac
• 100 g butter (lightly browned)
• 10 g salt
• lemon juice
• 60 ml apple cider vinegar
• 15 g sugar
• 60 ml hazelnut oil
• 1 bundle fresh parsley
• 200 g red currants, fresh or frozen
• 50 ml water
• 50 ml white wine vinegar or regular vinegar
• 50 g sugar
• 200 g kale
• 1 l lamb stock
• 1 l coldpressed crowberry juice (available from Íslensk hollusta)
• 50 ml cherry vinegar
• 10 g butter
• a pinch of salt