Take a bun and cut it into two equal half horizontal.

Now turn on stove and cut a piece of butter and put it on pan.

When it will melt, put one piece of bun on it.

Do same step with annother.

Now cut potato and tomato and mix all vegetables.

Put the mixture on pan and put another piece of butter on mixture and add required Salt and spices

When butter will melt, mix the mixture with a spoon.

Mix the mixture for sometime continuosly.

Now turn off stove. Put the mixture on one bun and then close it with another bun.Now serve it.