Mix cornstarch, 1 tablespoon soy sauce, 1 tablespoon black pepper powder, and salt in a bowl with 1/4 cup water.

Mix well to create a batter.

Heat a flat skillet with oil.

Dip cubed tofu into the cornstarch batter and carefully fry on both sides until golden brown.

Remove the fried tofu and set aside.

In the same skillet, add chopped onion and ginger garlic paste.

Sauté until the onion is translucent.

Add chopped celery and the fried tofu to the skillet.

Add 2 tablespoon green chilli sauce, 1 teaspoon soy sauce, 2 teaspoon black pepper powder, 1 teaspoon sugar, and salt to taste.

Stir fry until the celery is cooked well and not too soft.

Check seasoning and adjust if needed.

Serve immediately.