Rinse and drain the uncooked brown rice in a fine mesh strainer.
In a medium saucepan, bring ½ cup of water to a boil.
Add in the rinsed brown rice and stir to combine.
Reduce heat to low and let the rice simmer for 1 hour, stirring occasionally.
After an hour, check the consistency of the rice. If it has a porridge-like consistency, continue to cook for another 30 minutes until it becomes a thick paste.
Once the rice is a thick paste, remove from heat and let cool for 10-15 minutes.
Using a fine mesh strainer or cheesecloth, strain the rice paste over a bowl to remove any lumps.
Transfer the strained liquid back into the saucepan and bring to a boil over medium heat.
Reduce heat to low and let it simmer for another 20 minutes, stirring occasionally.
Once thickened, remove from heat and let cool.
Store in an airtight container in the refrigerator for up to 2 weeks.