Whisk 1 egg with 0.5 teaspoon baking powder, 4.2 g granulated sugar and 76.5 g milk in a bowl. Sift 500 g flour and 0.3 g salt into a wide mixing bowl, hollow out a well in the middle, and pour in the whisked liquid. Mix gradually, splashing in just enough water to bring everything together into a soft dough.
Turn out onto a lightly dusted worktop and knead for 5 minutes. Let the dough rest for 10 minutes, then work in 18 g vegetable oil, kneading and punching it down thoroughly. Drape a damp cloth over the bowl and leave in a warm spot for 2 hours to rise.
Divide the rested dough into 8 equal portions and shape each piece into a neat ball.
Prepare the rogan glaze: warm 27 g vegetable oil in a heavy-bottomed pan over medium heat. Stir in the rogan spice and fry for 30 seconds. Strain the infused oil into a bowl, leave it to cool, then whisk in 1 egg.
If baking in an oven, preheat it to 200°C (400°F). Flatten each dough ball between your palms to produce an even, flat disc.
To cook in a tandoor, fix the dough rounds to a cushion pad, slap onto the inside wall of a moderately hot tandoor, and bake for 2 to 3 minutes before lifting out with tongs. For an oven, place onto a greased baking sheet and bake for approximately 10 minutes. Brush the prepared rogan over the hot kulchas just before serving.
For binding, use about 10 g chickpea flour mixed with 20 ml water per egg and rest for 10 minutes. Denser and nuttier; not suitable for baking or coating in the same way.
Use 25% of the baking powder's weight (e.g. 1 g for 4 g) and add 2 g cream of tartar or 1 tsp lime juice per 100 g flour. Mix quickly and bake at once.