this post was submitted on 22 Dec 2023
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When a potato cooks, the starches contained in each cell are released as the cell walls break down. These starches absorb the potato's internal moisture and swell and soften. These two processes are what transform a raw, hard potato into a cooked, softer potato fit for mashing.

If you cut your potatoes up before boiling them, the starches absorb the internal potato moisture as well as the water in which they're being boiled. If they boil for too long, they absorb too much water and your mashed potatoes will become gummy. The difference between perfectly cooked potato pieces and soggy pieces can sometimes be as little as a minute or two.

An easy workaround is to boil potatoes whole. They'll take a bit longer to cook but you can leave them in the hot water after boiling without undesirable effects, keeping them warm until it's time to mash them. I start my potatoes boiling as soon as I begin cooking and mash them immediately before dinner.

If they need more moisture, you can add a bit of hot potato boiling water or another liquid. This way, you have more control of their moisture content.

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[–] DocMcStuffin@lemmy.world 63 points 10 months ago (4 children)

I've never had gummy mashed potatoes, and I've been giving them a 1" chop for years. Takes 10 minutes to cook then drain them right away. They come out fine every time. Plus the butter melts right away when you throw everything together.

[–] Aleric@lemmy.world 44 points 10 months ago (5 children)

To be totally transparent, I never had gummy mash until my wife and I got together. She used to boil her potatoes, let them sit in the hot water until closer to dinner, then whip them with beaters. She's from Ireland, I joke that the potato blight was a failed preemptive strike to prevent her from ever touching a potato.

[–] ChaoticEntropy@feddit.uk 59 points 10 months ago* (last edited 10 months ago)

So I don't have to do any of what you're saying in your post, I just have to not do the weird stuff your wife does. Cool.

[–] deo@lemmy.dbzer0.com 27 points 10 months ago (2 children)

Pretty sure it's the beaters (assuming that's an electric hand mixer type-thing, i've never heard them referred to by that term) that made them gummy. Over mashing will break up the cell walls too much, releasing the starches and ruining the texture. Cooking chopped or whole doesn't matter as much, since the number of cells broken by chopping is negligible. And the skin is water permeable anyway.

You gotta mash by hand, that's all.

[–] Cheradenine@sh.itjust.works 8 points 10 months ago* (last edited 10 months ago)

You are correct, op has no idea what they are talking about. Potatoes contain two different types of starch, in differing amounts depending on the kind of potato. Amylase, and Amylopectin, the second when overworked will make gummy potatoes. Overworking them is what makes them gummy.

1" dice, fork tender, food mill, ricer, or fork, perfect. If you want them extra smooth simmer in milk or cream (not water), strain and mash, then fold in the drained liquid gently with a spatula.

And the 'hot potato boiling water' contains mostly Amylase. If you add that it will make them more slippery/slimey.

[–] GentlemanLoser@ttrpg.network -1 points 10 months ago

This person potatoes

[–] Sir_Premiumhengst@lemmy.world 8 points 10 months ago

+1 for honesty

[–] TheDoctorDonna@lemmy.world 3 points 10 months ago (1 children)

She might as well have made box potatoes. Has she tried not doing...all of that?

[–] Aleric@lemmy.world 5 points 10 months ago (1 children)

We cater to our strengths now. I cook and organize, she cleans.

[–] TheDoctorDonna@lemmy.world 2 points 10 months ago

Good call, my husband cooks, I bake. It works

[–] GentlemanLoser@ttrpg.network 2 points 10 months ago

It's the beaters making it gummy. Mash by hand, it's too easy to overdo with an electric mixer.

[–] Tarquinn2049@lemmy.world 5 points 10 months ago

It's not "the only way to avoid gummy mashed potatoes", it's just an easy way to guarantee it if you keep having the problem. If you don't, then do it your way. It's harder, but you already have it nailed, so don't worry about it. Cooking faster can be a good thing if you want it, and are able to deal with them exactly when they need to be dealt with. Some people would very much prefer an easy guarantee even if it takes longer.

[–] NounsAndWords@lemmy.world 3 points 10 months ago (1 children)

What do you use to mash them?

[–] DocMcStuffin@lemmy.world 2 points 10 months ago (2 children)

Potato masher then hand mix. I also have a ricer but 9 times out of 10 I don't want to mess around with it.

[–] NounsAndWords@lemmy.world 1 points 10 months ago

Thanks, Doc

[–] SatansMaggotyCumFart@lemmy.world 0 points 10 months ago

Why would you use a ricer if you’re not making rice?

[–] grabyourmotherskeys@lemmy.world 3 points 10 months ago* (last edited 10 months ago)

You have to select starchy potatoes, not waxy, and let them steam dry (e.g. drain water in metal colander and toss in a warm oven or on the stove for a bit). Mix in the seasoning and milk/butter after they are mostly mashed for better control of consistency.

Edit: was agreeing. Glueyness is not because they are cut up.

[–] 404@lemmy.zip 40 points 10 months ago (2 children)

Also: beating the potatoes with an electric mixer because you're too lazy to mash them will produce a glue-like consistency. Don't do that.

(Michael if you ever read this, please know that your cooking fucking sucks.)

[–] bighatchester@lemmy.world 6 points 10 months ago

I have a potato ricer makes perfect mashed potatoes every time . Also good for getting water out of shredded potatoes for hash browns.

[–] ChaoticEntropy@feddit.uk 3 points 10 months ago

That sounds horrifying.

[–] Coreidan@lemmy.world 20 points 10 months ago (1 children)

Gummy? What? I cut my potatoes into quarters before boiling and never have my mashed potatoes been “gummy”. What in the world are you putting in your potatoes?

[–] GentlemanLoser@ttrpg.network 3 points 10 months ago

They're over-mixing, I bet.

[–] 0xD@infosec.pub 13 points 10 months ago (1 children)

Adam Ragusea has great videos on mashed potatoes, even talking about exactly your point:

https://www.youtube.com/watch?v=u94l5bS2d_o

https://www.youtube.com/watch?v=NYDyobSRmw8

[–] Daxter101@lemmy.blahaj.zone 1 points 10 months ago

Adam, my beloved

That channel is amazing.

[–] IMALlama@lemmy.world 7 points 10 months ago (1 children)

It looks like I'm the odd person out: I cut my potatoes before boiling and use a KitchenAid stand mixer for the mashing. My mashed taters are usually soft/fluffy/yummy.

For mashing, less is more. If you know this going in, there's no harm to using a stand mixer.

Put your desire amount of butter in the bottom of the stand mixer. Peel, slice and add to cold water. Salt if desired. Boil until they cleve cleanly with a fork. Drain, dump on butter, let rest a few minutes to soften the butter. Mix and add milk as necessary. A little minced rosemary with the potatoes when they go into the stand mixer is 👌

[–] punkwalrus@lemmy.world 2 points 10 months ago

Nope, came here to post the same.

[–] Nommer@sh.itjust.works 7 points 10 months ago

Huh? I admit I'm not really much of a cook but I've always chopped soaked in cold water then boiled in a fresh pot of water. They've never been gummy.

[–] match@pawb.social 4 points 10 months ago

Sous vide your potatoes if you're a fancy bitch 👑

[–] whynotzoidberg@lemmy.world 3 points 10 months ago

I prefer to dice and soak in cold water first to get rid of that excess starch. Saving cook time is a win for me.

[–] Zotamorf@lemmy.world 2 points 10 months ago

I bake my potatoes. Score the skin as shallow as you can into 1" squares or smaller, rub with clarified butter and salt generously. Cook at 400F to an internal temp of about 205F, let cool a bit before mashing. The skin bits will be crisp and delicious.

You have to add a little more liquid back, so have some heavy cream on hand or at least evaporated milk or half-and-half.

[–] Eeyore_Syndrome@sh.itjust.works 1 points 10 months ago* (last edited 10 months ago)

Mostly it's about using room temp water in the pot.

If you use hot water, thinking they will cook faster, that's the step that will make them gluey for sure.

So start them off in room temp water.

I prefer unpeeled Red Bliss 🥔 myself.

I simmer some milk or cream and butter with some roasted garlic for the real goodness.

Bigger potatoes, chunk em into quarter size.

Definitely peel starchy potatoes.

Waxy ones like Red Bliss or Golden/New Potatoes, I leave the skin on for nutrients/nutrition.

And don't let them sit in the water after for too long, at least drain them first if you aren't gonna mash right away before serving.

[–] satans_crackpipe@lemmy.world 1 points 10 months ago

Adjusting an early process to compensate for faulty processes further into cooking isn't the right answer. I always cut potatoes before boiling. They never turned out gummy and lots of paying customers agreed.

[–] saltesc@lemmy.world -4 points 10 months ago

Also, microwave your potatoes for a few mins first with a few fork holes.

They're mostly water so the microwave boils them from the inside out. Then when just becoming soft, put them in a boiling pot or oven. Cuts out so much time.