Cauliflower might work.
I've put cauliflower in a food processor to get it to a uniform small-ish size, and then stir-fried it until soft, as a low-carb substitute for rice.
Maybe you could dice it into small pieces and do the same.
Boiling or steaming instead of stir-frying may give you a softer potato-like texture.
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Starchy is kind of the nature of hash.
I am not sure that you would still have a hash if you eliminate the potatoes, but you should get something delicious in any case.
This low carb website suggests using cabbage in a hash-like dish.
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Split pea & shallot mash from the GL diet book might work.
Soak 225g split peas in cold water for 2 hours, drain place in pan & cover with water bring to boil & skim.
Add 1 bay leaf & 6 sage leaves (I use thyme) simmer until tender, meanwhile fry off in olive oil
3 finely chopped shallots
( I use onion) add 2 tsps cummin + 1 clove minced garlic.
Fry till soft.
Drain split peas & retain water.
Mix shallots with s/peas & remave bay leaf.
process or blend adding water to suit the consistency you like.
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Cubed celery would be a good start.
I would mix the celery with carrots and sweet potatoes, though they are only 'less' starch.
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I have used diced turnips in dishes as a replacement for potatoes.
That may work if you enjoy eating turnips.
Of course the taste will be much different than potatoes.
According to Wikipedia (eep, I know... but just for a rough idea): 100 grams of..
Turnips 7g carbs Potatoes 17g carbs
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I am following a low-carb diet, and would like to make corned beef hash at home with left over corned beef brisket. Onions are no problem, but I would prefer to avoid root vegetables, and potatoes in particular. What would make a good substitute, in terms of texture and taste?
Replace the potatoes in a corned beef hash with something that isn't starchy?
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<substitutions><potatoes><corned-beef>
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cooking.stackexchange.com/users/10218/RI Swamp Yankee
The starch is part of the nature of hash, but you could try replacing the potatoes with cauliflower, split pea & shallot mash, cabbage, cubed celery or diced turnips. The essence of hash is quite starchy so removing potatoes would not be a hash. You could make something similar using cauliflower, split peas, celery or turnip.
You could use cauliflower, split peas, cabbage, celery or turnips. Removing the starch would make it into a different dish.