Just declare it -- take a look at what's permitted and you'll get an idea. I always declare food, even if it's just a chocolate bar, and rarely do I get more than a question or two. Once during the bird flu scare I had a can (shelf-stable) of foie gras confiscated, which was disappointing, but as the agent pointed out, better than the stiff fine levied had I not declared it.

A friend who habitually smuggled in frozen game finally got caught, and in addition to the fine was warned that the info would be recorded. On subsequent trips into the U.S. the CPB agent would ask, "any moose meat?"