Given a paragraph about cooking, and a set of conversational question answers about the paragraph, answer a follow-up question from the paragraph. The paragraph has a prefix 'CONTEXT:'. Each conversation question has a prefix 'Q:' followed by answer prefix 'A:'. The final followup question has a prefix 'FOLLOWUP_Q:'.

Q: CONTEXT: Yes, you can freeze parmesan cheese. Even without freezing, Parmesan is very durable since the low water and high salt content prevents mould from growing. The younger varieties may be more prone to mould growth (having a higher water content), but I've kept ripe Parmesan (30-36 months) for at least a year in the fridge without problems (and it would probably have stayed good much longer). Just remember to keep it wrapped in paper, not in a sealed plastic container to prevent a buildup of condensation.  <sep>  Q: Can I freeze Parmesan? A: you can freeze parmesan cheese  <sep> FOLLOWUP_Q: How long can I keep it for?

A: I've kept ripe Parmesan (30-36 months) for at least a year in the fridge without problems
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Q: CONTEXT: The primary reason is definitely convenience. If you don't want skin and seeds in your sauce, then you have to do some work to avoid it. Yes, it's possible, e.g. passing through a food mill, or blanching and peeling plus retaining only the flesh, but having it already done is a whole lot easier.Passata is usually much thicker too, so it won't need as long a cooking time to reduce into a non-watery sauce as fresh tomatoes. On top of that, you don't have to worry about whether you can find good fresh tomatoes, e.g. if it's winter and they're out of season.Your two cases for comparison seem to overlook this: if you just chop and cook, you'll have skin and seeds in your sauce, as well as excess liquid to cook down, while if you use passata, you won't. (Also, for what it's worth, you'd need pretty giant tomatoes to get the equivalent of 3/4 cup of passata out of one tomato.)Of course, if you don't mind skin and seeds, it's also perfectly fine to simply cook fresh tomatoes and be done with it.Note that you can often get similar advantages from other canned tomato products. In the US, crushed tomatoes are far more common, and a roughly similar texture. (Peeled whole tomatoes, diced tomatoes, tomato sauce, and tomato paste can also be useful depending on what texture you're aiming for.)  <sep>  Q: What exactly is Passata? A: crushed tomatoes  Q: Is it better to use Passata instead of fresh tomatoes? A: The primary reason is definitely convenience  <sep> FOLLOWUP_Q: Is the procedure that much more difficult to use fresh tomatoes instead of using Passata?

A: f you don't want skin and seeds in your sauce, then you have to do some work to avoid it
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Q: CONTEXT: You don't need to defrost it, you can add cold roux directly to a boiling liquid. To avoid lumps from the roux, most cooks suggest you either add cold roux to a hot sauce, or cold liquid to hot roux. If you heat the roux gradually with the liquid you may get lumps, and don't get a good impression of how much thickening is going on until it heats fully.  <sep>  Q: I like preparing a large quantity of Roux and pouring them in ice trays to keep them in the freezer. How would I defrost them? A: You don't need to defrost it, you can add cold roux directly to a boiling liquid  <sep> FOLLOWUP_Q: How would I use it in something like mac and cheese?

A:
If you heat the roux gradually with the liquid you may get lumps, and don't get a good impression of how much thickening is going on until it heats fully.
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