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:`.

Q: CONTEXT: Flour (+ water, either directly or from other ingredients such as egg white) gives the pastry structure. As you knead the flour, the gluten network develops and results in elasticity. When cooked, water evaporates from the dough leaving a rigid gluten skeleton. Fat does not mix with water and thus stay in blobs in between the gluten network. This weakens the gluten structure, making the pastry crumble.For this reason, you often see in recipes for shortcrust to avoid overmixing the fat. Buttery biscuits such as shortbread crumble more than crackers, which have more water. The same rationale applies to puff pastry. The thin fat layers are impermeable, so water steam gets trapped and exercise pressure upwards, lifting the pastry up.Quoting @GdD in the comments, the punchline is:more fat = crumblier, less fat has more structure.  <sep>  Q: How does altering the fat-to-flour ratio affect the pastry? A: more fat = crumblier, less fat has more structure 

A: Is it only crumblier after it bakes?
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Q: CONTEXT: Yes, nuts are very fatty, and they will eventually go rancidâ if this is the case, they will taste very poor. They can also dry out, or in more rare cases (especially if stored improperly) be infested with insects or molds.Generally, they should be good for six months to a year at their best flavor, depending on the variety (in the shell).Five years is a little long. I am not sure I would want to eat nuts that old.  <sep>  Q: Do nuts ever go bad? A: es, nuts are very fatty, and they will eventually go rancid 

A: What causes them to go rancid?
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Q: CONTEXT: Bananas are imported unripe and then ripened in the country of sale. This ripening is achieved by forcing ethylene gas through the bananas in special pressurised rooms.Bananas naturally produce ethylene as they ripen, so you could just put them in a sealable plastic bag to contain that gas. Tomatoes also produce ethylene, so you could pop a couple of those in as well, but be aware that they'll also ripen faster too.  <sep>  Q: How can I speed up banana ripening?### A: Bananas naturally produce ethylene as they ripen, so you could just put them in a sealable plastic bag to contain that gas 

A:
How long should I leave them?
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