Place large frying pan on medium heat and add olive oil.
Once the oil is heated through, add garlic and ginger and sauté 30 seconds till fragrant.
Add tomato sauce, turmeric and cayenne and stir for one minute and add potato disks.
Stir for 2-3 minutes, ensuring that each disk is coated with oil and tomato sauce.
Sprinkle some water on top of potatoes, and cover pan with a lid or with foil and turn the heat to low.
Allow potatoes to cook in their own steam for 15 minutes. At the 10 minute mark remove the lid/foil and insert a knife into the potato to test for doneness.
When done, a knife should slide through freely. The tomato sauce should look thick, coating the potatoes.
Allow potatoes to come to room temperature. In the meanwhile, prepare the spiced yogurt.
Add 2tbsp of water to yoghurt and whip. Add dried mint and salt to taste.
When ready to serve, arrange potatoes in your dish and drizzle with yogurt. Dust with dried mint.