Place the chhana on a flat surface and knead it with the heel of your palm. About 4-5 minutes or so till your palm is almost oily. Keep aside.
Heat the ghee in a deep bottomed pan, add the coarsely ground green peas, cook for 5-7 minutes over a low flame, stirring occasionally.
Add the chhana to the peas. Mix well with a wooden spatula.
Now add the jaggery, grated ginger and ground black pepper. Give it a hearty stir.
Continue to cook till the mixture comes comes off clean from the sides of the pan.
Finish with chopped almonds and pistachios, mix well.
Grease a flat dish with very little ghee. Gently spread the green peas and chhana mixture on the dish, about 3/4 inch in thickness.
Using a sharp knife, cut into 1 inch squares.
Refrigerate for 30 odd minutes or so and serve.