Soak the soybeans overnight in a pan of water. The water should cover the beans well.
The next day, drain the water through a sieve and rinse the soybeans with water.
Place the soybeans in a container with 1 liter of water and puree with a blender or hand blender.
Then place in a large sieve, a thick cloth or a nut milk bag and pour in the pureed mixture.
Press very firmly so that the soy milk comes out.
Pour the soy milk into a large pan and fill up to 1 liter with water. Then bring to the boil. Make sure that it does not boil over.
Add the salt.
Simmer the soy milk for approx. 10 - 15 minutes at 90 degrees Celsius. Stir again and again.
Then remove the pan from the heat and leave to cool to 70 degrees Celsius.
Gently stir in 5 tablespoons of lemon juice, cover and leave to infuse. Then stir and strain through a fine-mesh sieve.
