Measure out COLD soy milk or any other plant-based milk, extract, the flavor of choice, lecithin, sweetener, some tapioca starch, and oil (if desired). Combine all in a sauce pan.
Mix the starch into the milk before turning on the heat.
Turn the heat to medium and stir frequently until it comes to a slow boil.
Let it boil for a few seconds while stirring constantly and then turn off the heat.
Store in an airtight jar or bottle for up to 5 days.
