Many unusual methods have been used to test pasta, but the best is the most simple: Taste it! Start testing a few minutes before the manufacturer's directions indicate: Remove a piece of pasta from the pot, wait a moment for it to cool, then take a bite. Now take a close look. If you see a large white, uncooked center or ring, continue to cook pasta a minute more, then test again. Your pasta is cooked and al dente if there is a small white dot of uncooked core. For softer pasta, wait until there is no white uncooked core showing.
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