What's the science behind making German potato dumplings (Knödel) fluffy but not fall apart?
First off, I'm German, so you would think I know, but it seems traditional cuisine has not been passed down my family tree.
This question really consists of two parts:
- What makes potatos dough (or I guess, starchy dough in general, there's all kinds of dumplings, there's pasta, etc) keep its shape when you boil it in water? This may extend to some degree to deep frying.
- What properties make balls of dough "fluffy" or "textured", but not "tough", "rubber-like" etc.? I guess this will go somewhere along the lines of what structure the starch granules form with the water, how stable it is, and how dense.
There is about a million recipes online for cooked, raw, and 50-50 knödels. Some have egg, some don't, and just about everywhere there's people asking how to do them right. There's also a question to that here on this site.
However, it's hard to get some actual information on the key aspects (this is a problem I have with recipes in general). I'm pretty sure there ought to be no egg and not a lot of flour in the dumplings. I'm also certain that either all cooked, all raw or half-half are common and widespread varieties, but there it stops.
I would like to find some science based instructions, the kind of articles Kenji runs on The Food Lab. It looks like most recipes have some way of enriching the dough with starch above what's in the potatoes anyway, by draining water from the potatoes and adding starch powder. The father of a friend wraps the potatoes in cloths and puts them through the spin cycle of the washing machine, which (because of the preceding meticulous cleaning of the latter) is a tedious procedure that's only done for Christmas.
Millions of grandmas have reached the proper end result via various routes, using plain ingredients and unsophisticated equipment, so there should be some basic principle at work, which can be analyzed with science, very much like with roasting beef or frying potatoes.
Maybe, we could dig up something about related recipes, like gnocchi, which would be helpful.
Best Answer
Your dealing with a few things here. First is starches in general. The thing to know about starches is how they gelatinize and at what temperatures.
This powerpoint is a nice primer on that topic. www.cfs.purdue.edu/class/f&n630/gelatinization.ppt
Basically your dealing with amylose and amylopectin, together they are what we know as a starch. When they come in contact with water the starch cells begin to swell and when their gelatinization temperature is met they burst and release their contents into the medium they are in. In the case of a dough ball, your dealing with tons and tons of little cells being held together loosely at first by the physical pressure of kneading them into balls and then when the heat causes the starches to gelatinize they adhere to one another kind of like being caught in a net.
Now the fluffiness portion of the question can really depend on how the dough is being cooked. For something like a dumpling being cooked in the boiling water, one would typically want to work the dough as little as possible to avoid making it too dense and if using flour to lessen the gluten formation that can make it very chewy like bread. Some recipes call for leaveners that can create gas bubbles when heated to a certain temperature and then through gelatinization the bubbles are trapped inside the dough and create an airy texture.
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Why are my potato dumplings falling apart?
If you use too much potato, the mixture might not bind properly and the dumplings may fall apart; if you use too little potato, the dumplings will be too heavy with flour and egg. It's wise to buy a few extra potatoes just in case. You will need a potato ricer, as a potato masher will not yield a fluffy enough result.Why do bread dumplings fall apart?
The two reasons your dumplings might fall apart It might be that your dough consistency is too watery. It's totally normal for the dough to be sticky. The best way to check the consistency is to cook one test dumpling ahead of all the other ones.Can you overcook potato dumplings?
Add the potatoes into a large pot, pour over cold water, salt the water. Cook the potatoes until fork-tender, don't overcook them.What is knödel in German cuisine?
Kn\xf6del is the German word for dumpling, and as such there are dozens of varieties. The most popular, however, are probably semmelkn\xf6del, which are made from day-old bread rolls (semmeln) soaked in warm milk and seasoned with onion, parsley, and a pinch of nutmeg. There are two basic ways to form bread-based kn\xf6del.what. (Bo Burnham FULL SHOW HD)
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Answer 2
Another German here who also tried to make dumplings from potatoes.
From my experience with (almost) all potato dumplings, I found that adding more flour (or starch) makes the dumplings keep their shape in water, but at the same time makes them taste more 'rubber-like'. I just checked in 'Il Cucchiaio d'aregento', they say so, too.
Here are some tricks that helped me to minimize the amount of flour in my dough:
- Always use 'mehligkochende' (deepl translates it as floury) potatoes
- At first, prepare them in the oven, wrapped in tin foil, this way they turn out a lot less 'watery' and requires less flour for the dough
- Never use any sort of blender, just mash the potatoes
- Add semolina instead of starch or flour to the dough (I found that in an Austrian recipe for Marillenknödel)
- The water in which you boil the dumplings should be just below the boiling point so it does not tear apart the dumplings (You may want to steam them at first)
I hope my techniques will help you to get closer to the desired result as they did for me.
PS: Similar tricks also hold for Gnocchi
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