Many years ago, we grew ours on white rice. Eaten fresh, they were quite tasty. Also OK after freeze drying. But commercial Psilocybe do have an unpleasant taste, even fresh. Maybe they grow them on manure.
Eating them in something like a ham sandwich makes it OK in my opinion.
I've only ever ordered them from legal producers so I don't know how much extra work they put into making them not taste bad versus illegal growers.
For anyone that's interested, basically just roughly dice 1/8 oz. of dried mushrooms and add a scoop of your favorite tea. Put the mix in a large teaball (or multiple small ones). Boil 2-3 cups of water. Let the water cool for 20-30 seconds on a cold burner before pouring into your teapot. Steep and drink!