Hasselback Potatoes with Garlic & Parsley Butter

potato 52.5% , butter 23.8% , rapeseed oil 11.9% , sal fat 5.9% , salt 0.1% , garlic puree 0.1% , onion 0.1% , black pepper 0.1% , garlic 0.1% , parsley 0.1% , lemon juice 0.1% , yeast extract 0.1% , oregano 0.1% , basil 0.1% , thyme 0.1% , garlic extract 0.1% , sunflower oil 0.1% , Acid 0.1% , white pepper 0.1% , Antioxidant 3.9%