In a bowl mix together milk, yogurt and sourdough starter. Spread the starter evenly in the mixture.

Add the flour, baking powder and salt. Mix well till a shaggy dough forms.

Cover with a damp towel and place in a warm place for 2 hours. If using the Instant Pot, let it rest covered on yogurt mode for 45 minutes.

After the dough has rested, transfer to a lightly floured surface and divide into 6 parts.

Preheat a cast iron or thick griddle/ tava to medium high flame.

Using one part of the dough roll it out to a round or oval of ¼ inch thickness.

Spread black sesame seeds and other toppings like green chili, garlic or cilantro. Press it down so that they stick.

Turn the naan over and apply some water. Transfer the naan to the tava, wet side down.

Cook on medium-high flame till a few spots appear on the naan.

Turn the tava over and cook on direct flame till the naan bubbles and all the portions are cooked.

Remove from tava and spread some salted butter on it. Serve warm with your favorite Indian curry.