Rub Ghee or butter into the flour until the mixture is crumbly. Mix in the ajwain and salt and add sufficient water to make a firm but pliable dough. Leave it for 30 minutes, covered with a damp cloth.
For Preparing The Filling:
Heat the oil and saute the cumin seeds in the oil until they crackle.
Add the remaining ingredients: cooked and diced potatoes, cooked green peas, green chilly, coriander powder, turmeric powder, cayenne powder, amchur powder and required salt. Saute well in low flame for 1 minute. If you want to give a gentle crush to the potatoes you can do so.
Leave it to cool.
Roll out the dough thinly, then cut into 3-inch circles. Cut each circle in half. Put a spoonful of filling on one semi circle and roll over the top, pressing the edges firmly to seal.
Heat oil and deep fry them till they become golden brown.