More info about Egyptian Walking Onions, with some pictures.
I needed onions for a recipe, and have used all the "regular" onions from last year, so I dug 4 clumps of EWOs. I took the kitchen shears out with me, so I could cut off the roots and parts I didn't need. (I don't need any green onions atm, and they don't keep as well. Plus, I can have fresh any time.)
The 4 clumps were chosen by these criteria: Are they big, and are they in a crowded spot? By big, I look at the stem coming out of that particular onion. The bigger the stem, the bigger the onion.
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The 2 bottom ones are big, for EWOs. The one above it is on the smaller side. You lose some of the size when you take off the outer layers to clean them up.
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About the topsets... sometimes they will grow another topset. That's what this one did, and instead of bulbils, it looks like it's trying to flower. (Some of the topsets will do that; never tried to save seed from these.)
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Close up of the flower.
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When you try to slice them like you would a regular onion, the layers tend to separate, as they aren't very thick. I slice them about 3/16-1/4" and call that good. With the bigger bulbs, you can sometimes see that it's trying to form a new bulb. That's how the clumps grow more onions. So the individual bulbs won't get much bigger than the big ones I had in the picture. They will then split and form another bulb.