I had some mold in my egg so I did a high heat burn to try to get rid of it. Iook it up to 700 and left it there for about 10 minutes and let it slowy come down to 450. Total burn time about 2 hours- beginning to end. My lid is now sealed shut. So how do I get it open. I read somewhere about dropping a lit starter cube in through the top. Wikll this allow me to open it without ruining the gasket.