I'm not super familiar with the cooking method, but gather the food is in direct contact with plastic during cooking temps... Which is a no go in my wife's kitchen. I suspect silicon will be one of those things decades from now that's found to not be as safe as the claims make it seem. (I'm not saying don't do this, I don't care what other people do, but considering scientific research is finding micro plastics in our blood, muscle tissues, including heart, and more it's not something I'd recommend personally. We only get one body. Health over wealth.) If mining heat could be concentrated it would open up so much more potential.

There's got to be a safe material that is waterproof that can snuggle right up against it to allow for maximum/even conduction of the heat.