First of all take boiled potatoes in a big mixing bowl then add in red chilli powder, garam masala, fennel powder, green chilli, ginger, lemon juice, coriander leaves and salt.
Now mix all the ingredients very well, mash potatoes with hands, take white breads and remove the thick edges.
Now take one slice of bread, put around 2 tsp of potato mixture on slice then cover with another bread slice and put on tawa for roasting.
Make all the sandwiches ready similarly.
After roasting sandwich for few minutes apply some ghee on top then turn the side and apply some ghee on this side also, roast the sandwich till become nice golden brown.
Now turn the heat off and take out the sandwich in plate and cut into two parts and serve.