Where is it? Where is it not? The taco's existence is uncertain.
Perhaps it is here, perhaps it is not. The only way to know is to observe it.
But if you observe it, it becomes a mere mortal, no longer existing in quantum superposition.
Or maybe, just maybe, it's in the kitchen, waiting for you.
Don't bother trying to find it, just eat a taco and hope for the best.
Disclaimer: The existence of the taco is not guaranteed. Or is it?