In a large bowl, mix all-purpose flour, water, and whisked egg. Add garlic powder, ginger powder, paprika, ground white pepper, and celery salt, stirring until smooth.
Add cauliflower florets to the batter, tossing to ensure they are well-coated.
Heat sunflower oil in a pan to 175ºC / 350ºF. Test with a drop of batter. Fry florets for two minutes on each side, leaving space between them.
Transfer fried florets to a strainer lined with a kitchen towel to absorb excess oil. Enjoy your crispy Kung Pao cauliflower with sauce!