A year or so ago I bought a Lodge 6 quart Dutch Over. It’s a great pot and I’ve been very happy with it.
However, I’m curious about one of its features. There are 3 rectangular “bumps” or cleats on the bottom of the lid where it touches the upper edge of the pot. They are spaced 120 degrees apart around the circumference of the lid (see photo). There obvious purpose is to lift the lid off the pot allowing a gap between the lid and pot.
It would seem to me that you would want to seal the lid as tightly as possible to the pot to avoid the built up steam from escaping rather than condensing on the bottom of the lid and dripping back into the pot. In fact, a lot of recipes recommend placing a sheet of aluminum foil between the lid and pot to ensure a tight seal.
This design feature seems to ensure that the steam will in fact escape. Is this a safety feature to avoid an ad hoc pressure cooker or is there some other reason for it.
I contacted Lodge and asked them but never received a reply.