Alfredo sauce is heavy, but not in a bad way. Think of it as pillowy—a sauce that clings to fettuccine like a warm blanket. It should feel indulgent, not greasy or watery.
A perfect Alfredo is silky with a slight sheen. When it coats the back of a spoon, it should be thick enough to leave a trail, yet fluid enough to dip bread into. If it breaks or becomes grainy, the emulsion has failed.
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Pro tip: Eat Alfredo immediately. It does not reheat well; refrigerated Alfredo often separates into a sad, oily mess. Fresh is a non-negotiable rule for optimal taste.