Melt coconut oil in microwave by heating for 1-2 minutes. Check every 30 seconds until melted. Alternatively melt in saucepan on stove.
In a saucepan on the stove over medium heat, whisk in soymilk, melted coconut oil, tapioca starch, kappa carrageenan, onion powder, and salt. Whisk continuously until mixture begins to thicken. Continue to whisk until mixture becomes thick and viscous.
Quickly mix in acid as cheese will continue to thicken making it difficult to mix.
Transfer cheese to greased glass dish. Place in refrigerator.
In twelve or more hours, remove cheese from refrigerator. Slice, shred, or freeze according to preference.