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baking soda on a tray inside an oven
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5 from 1 vote

Homemade Lye water (Kansui)

Lye water (Kansui) is a food-grade alkaline solution used in many dishes. This is an easy way to make it at home with two common ingredients.
Prep Time2 mins
1 hr
Total Time1 hr 2 mins
Cuisine: Chinese
Author: Wei Guo


  • Baking soda
  • Water


  • Preheat the oven to 120°C (250°F).
  • Cover a baking tray with tin foil (aluminium foil). Spread an even layer of baking soda over the foil.
  • Put the tray into the preheated oven. Bake for 1 hour.
  • Leave to cool naturally then transfer to an airtight container (see note 1).
  • When needed, mix 1 part of baked baking soda with 4 parts of water (see note 2). Use the solution in recipes for your desired dishes.


1. Do not touch the baked baking soda with bare hands. 
2. Do not premix the solution in big volume when you're not ready to use it.