Wash and dry 250 grams of bhindi (okra), then cut it into medium-sized pieces and make slits in the center. Set it aside.
Peel the potatoes and cut them into medium-sized chips, making sure they are not too thick.
In a pan, heat some oil and fry the bhindi on medium-high heat until it becomes slightly soft. Remove it from the pan and set it aside.
In the same pan, with about 4-5 tablespoons of oil remaining, add 1 teaspoon of mustard seeds, 2 tablespoons of crushed coriander seeds, 1 tablespoon of crushed cumin seeds, and some curry leaves. Sauté the mixture.
Add the potato chips and mix well. Cover the pan with a plate, and add some water on top of the plate. Keep the flame on medium and cook the potatoes until they become slightly soft.
Add 1 teaspoon of green chili paste and 1 teaspoon of ginger-garlic paste, then sauté.
Add the fried bhindi, along with 1 teaspoon of coriander powder, 1 teaspoon of red chili powder, a pinch of salt, ½ teaspoon of garam masala, and 3 tablespoons of roasted besan. Mix well.
Cover and cook the sabzi on low heat for 2-3 minutes.
Finally, add 1 teaspoon of lemon juice and some coriander leaves. Mix well.
Serve bhinda batata nu shaak with roti or rice.