In a medium-sized saucepan, bring the water to a boil.
In a separate bowl, combine the finely ground cornmeal, cacao powder, sugar, ground cinnamon, and salt.
Gradually add the dry mixture to the boiling water while whisking continuously to avoid lumps.
Reduce the heat to low and let the mixture simmer for about 5-7 minutes, stirring occasionally to prevent sticking.
Remove the saucepan from heat and stir in the vanilla extract.
Allow the mixture to cool slightly before serving.
If desired, you can strain the drink through a fine-mesh sieve to remove any remaining solids.
Pour the cacao drink into mugs or cups.
Serve the Pinolillo warm or chilled over ice cubes, according to your preference.