The meals were like any other type of meal one would get at home. Meat, vegetable and starch. Often bread was baked if not daily. Some crews were clever and rigged up ice cream making machines.
But....the food for the crew was touted to be best.
Quote:
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that American submariners "had the best of everything and would never have tolerated substandard conditions."
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http://www.public.navy.mil/subfor/un...pig_boats.html