This is cool. I wonder how you ensure that your mould is made from food-safe materials. Presumably gratings are usually just cut glass, so that should be okay?

This is cool. I wonder how you ensure that your mould is made from food-safe materials. Presumably gratings are usually just cut glass, so that should be okay? They are not part of the usual food-safe supply chain, though. I guess to would be tricky to obtain the proper assurances if you wanted to do this commercially.