Glass of Boron.
It has many brand names: Duran, Simax, Borofloat, Fiolax, Jenaer..
Commonly used in labs because it won't leach any crap, even under high temperatures, and it's reasonably durable.
They have a bigger impact on your food than you think. Stabbing your food with Chinese Steel. I can't wait until the day I can buy borosilicate knives, forks and spoons. The only thing I can find is chop sticks..