Given a paragraph about cooking, and a set of conversational question answers about the paragraph, generate a relevant question to the topic of the paragraph. The paragraph has the prefix 'CONTEXT:'. Each conversation question has a prefix `Q:` followed by the answer prefix `A:`.

[EX Q]: CONTEXT: There is not really a turning point. The way that wine goes bad is the process of making vinegar. From wikipedia:The word "vinegar" derives from the Old French vin aigre, meaning "sour wine".The Canadian government limits things that can be sold as 'vinegar' to something with an acetic acid content of 4-12%, so you could do the technical-bureaucratic thing and wait for the acetic acid to get up to 4%.If you aren't hung up on technicalities, then you can use it as soon as it gets sour enough. It is done when all the alcohol has been changed to acetic acid, but it is a bit hard to taste since the acetic flavor dominates.  <sep>  Q: When is homemade wine-based vinegar simply bad wine? A: There is not really a turning point. The way that wine goes bad is the process of making vinegar 
[EX A]: Oh okay so I can store it in my cabinet?

[EX Q]: CONTEXT: I've never tried steaming bok choy, but yes, the ribs and leafy bits cook at different speeds.For stir frys I trim the bottom so the ribs come free, clean off any dirt that's gotten trapped in between, then stack up the leaves and cut the leaves from the ribs. I slice the ribs into about 5mm / 3/16" slices, and add them towards the end; the leaves I cut into ribbons (perpendicular to the ribs), and stir them in at the last second, so they barely cook. The center I just chop the top off the leafy bit, and slice the more rib-like bits a litte larger than the rest of the ribs (they're thinner, so cook faster).As I've never tried steaming it, and I don't tend to cook in bags (except for silver turtles when camping), this is going to be a complete guess. Now, it tastes fine al dente, so you could leave the ribs as large as I use for a stir fry, but en papillote tends to be fancier cooking, so I'd probably try for maybe 1/6" slices or a little thicker (maybe 2-3mm), and if you had a mandoline so they all came out even, that'd be great. I'd still cut the leaves into ribbons, just because it's easier to eat than a huge intact leaf.I'd assume that the leaves would cook at a similar rate as spinich, and the ribs closer to fennel, if that helps at all.  <sep>  Q: How should I prepare Bok Choy before I cook it? A: For stir frys I trim the bottom so the ribs come free, clean off any dirt that's gotten trapped in between, then stack up the leaves and cut the leaves from the ribs  Q: Are the leaves usable? A: yes, the ribs and leafy bits cook at different speeds 
[EX A]: how long do the rib take to cook?

[EX Q]: CONTEXT: If you want a similar texture and flavor, I recommend trying other similar root vegetables. I use turnips and parsnips in similar applications. They're both dense, white and have a slight sweetness to them and they should hold up relatively well to long cooking times.You might also enjoy yucca which can have a cooked texture similar to a cross between potato and banana. I've not tried them in this sort of application specifically but I think they should work.  <sep>  Q: What is a good alternative to potatoes in stews, soups and roasts? A: If you want a similar texture and flavor, I recommend trying other similar root vegetables  Q: Can you give examples of similar root vegetables? A: I use turnips and parsnips 
[EX A]:
How should turnips and parsnips be prepared before putting them in with the stew or soup?