Or would it be better to just make the tomato base in advance and braise the squid before dinner?
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No you cannot. You will wind up with rubber nuggets
Sorry, I completely disagree with the below poster. You absolutely can pre-braise squid the night before. As long as the cooking time is long, the squid will still be tender. I've done it many times, promise.
It basically tells you when it needs to be replaced.
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