Originally Posted By: Dignan
We occasionally get pre-grated bags just because it's easier for throwing something together for dinner, but I much prefer to grate it myself when necessary (for recipes, not snacking wink ) because I think it tastes better.

In the US at least, most pre-grated cheese contains additives, like corn starch to keep it from sticking together, and things to help it melt more evenly, under the assumption that you're mostly going to use pre-grated cheese for melting onto something.

Which may explain the difference in taste.
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Bitt Faulk