Hasselback potatoes with curry butter

Name: Hasselback potatoes with curry butter
Prep time: 15 min
Cook time: 1 h 15 min
Total time: 1 h 15 min
Yield: 6 portions
Ingredients: 6 potatoes; 6 tbsp extra virgin olive oil; 2 pinches sea salt flakes; ¼ tsp black peppercorns; 1 tsp coriander seeds; 2 tsp cumin seeds; 2 cardamom pods; 2 dried chillies; 1 tsp ground turmeric; ½ tsp ground ginger; 2 pinches granulated garlic; 100 g unsalted butter; 12 fresh curry leaves; 6 tbsp natural yoghurt