Kitchen

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I'm shopping for a 5 1/2 qt round Le Creuset french oven, will be my first Le Creuset. I understand that a tight fitting lid is important, but what does that really mean? Almost all of the ones I check out in the stores "wobble back and forth" if you press down on the lid at the edges while on the pot, some a little, some quite a bit. The lid also moves around some, side to side, hence not a tight fit? I just don't want it to wobble while I'm cooking, with lots of steam escaping!! Thanks for any pointers you can give.