You must add a little lemon juice at the end while the okra cooks. The lemon juice helps reduce the slime and makes the okra crispy.
Use this trick while cutting
The sticky slime troubles you not just during cooking but also while cutting. The slime sticks to the knife and your hands. You can rub a lemon slice on both sides of the knife before cutting the vegetable to reduce this issue. The knife will not catch much slime after you do this.
Use curd if you lack lemon
You can also use a little curd if you do not have lemon juice handy. Curd improves the texture of the okra and gives a mild sour taste to the dish. You just need to dry the washed okra completely, cook it without a lid, and add a little lemon juice at the end to prevent the sticky mess.