Soak Makhana in one cup of water for 2 hours. After that, strain them in a strainer.
In a mixing bowl/plate, grate/mash the boiled potatoes. Now add soaked Makhana, coriander leaves, Chopped green chillies, salt and black pepper powder.
Mix it well with the help of your hands while mashing the Makhanas.
Add Buckwheat flour and mix it well. This will help in binding the mixture.
Divide the mixture into equal parts and make round balls of them. Take one round ball, flat it between your palm and make space in centre. Place 1 cashew and 1 raisin in it. Gather from all sides, seal it and make round ball again. Again press it in between your palm to make a round patty.
Similarly you can make patty of all the round balls.
Heat oil in a pan / kadhai over medium flame and deep fry them till they are nice golden in colour.
Serve them hot and enjoy with mint Coriander chutney or yogurt or Masala chai.