Heat oil in a wide pan.

Add the potato pieces along with salt and fry for sometime.

:- If needed, cover it with a lid and let it cook on a low flame.

Add tomato and mix well.

Mash the whole mixture with a wide spoon, while still on low flame.

Add the egg into this.

:- If you don`t like the raw taste of egg, u may pour egg on a free side on the pan and scramble for some time.

Mix everything well on a medium flame, till it is semi dry.