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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:'.

CONTEXT: Milk won't help you - it's mostly water, and gluten develops from flour (more accurately, specific proteins in flour) and water.The way to reduce gluten development is to incorporate more fat into the batter. Lipids are hydrophobic and will prevent further hydration of the glutenin.Using a lower-protein flour will also help. If you're not already using cake flour, the reason it's called cake flour is because of the lower protein content.That being said, have you actually tried leaving the batter coarse? Just because the batter is lumpy does not mean that the cake will have big lumps. The entire mixture is wet, so unless you leave huge lumps of dry flour in the batter, you won't end up with a lumpy cake. There's a difference between don't overmix and don't mix - you're supposed to mix enough to incorporate, just don't try homogenize it. <sep> Q: How can I avoid lumps in the cake? A: have you actually tried leaving the batter coarse? Just because the batter is lumpy does not mean that the cake will have big lumps Q: No, I haven't. I'll try that next. Is it safe to add more milk into the batter? A: Milk won't help you - it's mostly water, and gluten develops from flour (more accurately, specific proteins in flour) and water.
Solution: What can I add to make it more softer and avoid hardening?
Why? This conversation is about the process of preparing cakes and how lumps can be avoided in it. The question asked is relevant as it is on the same topic and it asks how to avoid hardening of cake. This is also a followup question of the last conversational question and answer about adding more milk into the cake batter.

New input: CONTEXT: In a cookbook that old, the sour cream referenced is probably a home-fermented variety, used as a preservation method in the days before widespread home refrigeration. You can still do this with the appropriate bacterial cultures, but most of us now buy our sour cream at the store instead. That product is similar, but made in much larger batches with a highly standardized, refined bacterial culture, producing a product with a predictable sourness and texture. Home-cultured versions are more variable, but they use similar processes on a much smaller scale.Whether you want to call this the "same" is partly a linguistic distinction that depends on how much you want to consider the differences in scale and equipment between pre-refrigeration and modern methods.In contrast, the addition of something sour to cream is really a substitute, used when you don't have a proper sour cream available. A cook back in the 1890s could use the same substitution then as we might today. But the production of sour cream (and all sorts of fermented milk products, such as yogurt and kefir) is much older than that, and there would have been some variety of "traditional" sour cream available, though not universally or year-round in the days before mechanized food distribution systems. <sep> Q: Is sour cream in olde recipes the same as sour cream today? A: the sour cream referenced is probably a home-fermented variety, used as a preservation method in the days before widespread home refrigeration
Solution:
How would I make a home-fermented variety of sour cream?