Place amaranth and water in a pot and bring to a boil.
Leaving the lid partially on, reduce the heat to a simmer and cook for 25 to 30 minutes, stirring occasionally.
Once all of the water has been incorporated, gradually add in the soy milk, until the desired consistency is reached. Your finished porridge will be slightly gelatinous.
To serve, pour into a bowl, top with your favorite porridge toppings, and enjoy!