I vote for the cast iron dutch oven. You can even take it the beach and use it on an open fire - throw hot coal under it and a few hot coals on the lid (lid has a lip designed to hold hot coal and PRESTO, you have a great oven.
Also works on a stove, but you have to deal with the feet. The one I have has the feet cut down to just small nubs (so on the beach i have to dig a small pit)
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