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: One of the first things I learned in Indian cooking is that the combination of tomatoes, onions and ginger is self-thickening. As time went by, I realised that the thickening effect is far more noticable with old varieties of tomatoes - "beef" tomatoes and a lot of the modern varieties are difficult to thicken unless partially fried first.Despite the absence of ginger, I suspect that the thickening is purely a natural action between the tomatoes and the onion, and that the tomatoes used were some particularly nice old variety. <sep> Q: Why did my tomato soup turn thick and brownish? A: One of the first things I learned in Indian cooking is that the combination of tomatoes, onions and ginger is self-thickening Q: The above combination with garlic, onions, spices can't be all wrong, can it? A: beef" tomatoes and a lot of the modern varieties are difficult to thicken unless partially fried first
Do tomatoes have to be skinned?

CONTEXT: Adding herbs directly to baked goods usually results in very strong flavours. Infusing the sugar with the herbs gives a more subtle overtone rather than a full-on explosion. In some cases, of course, you might want a strong herb flavour, but where you just want a hint, infusing the sugar is great. The classic example is using stripped vanilla pods to make vanilla sugar, which adds subtle vanilla tones to cakes and meringues. <sep> Q: When and why would one infuse flavor into sugar for baking? A: where you just want a hint, infusing the sugar is great
Why not just add the ingredient directly into the recipe?

CONTEXT: Mixing it with milk (or liquid in general) is probably just to remove clumps. It clumps easily, especially when things aren't perfectly airtight (probably more common in your grandmother's time), and mixing in a small amount of liquid is an easy way to make sure it all breaks up.I'm less sure about the alternating. It is pretty common to alternate wet and dry as a way of getting things evenly mixed and avoiding lumps, so it's possible it's a variation on that. The paste might be too thick to easily mix into the wet, but also wet enough that it'd tend to stay as a lump if you mix it straight into the dry, so alternating wet-dry-paste might get you more even mixing? But if you're able to mix the paste smoothly into the wet, it's completely fine to just do that. <sep> Q: Why pre-mix baking soda into 2 tsp of milk? A: Mixing it with milk (or liquid in general) is probably just to remove clumps
it has to be added to the milk to form a tiny little bit of wet paste?