Pressure Cooked and Smashed Potatoes – Lesson 1 – Boiling and Maximum Capacity

Making mashed potatoes is incredibly easy, and fast, in the pressure cooker. It was the first thing I learned to pressure cook and I still boil potatoes in it at least once a week – mashed potatoes for cold weather and potato salad for when it’s warm outside!
Boiling
Boiling in the pressure cooker takes less time and less water than regular stovetop boiling. The closed environment keeps the water, and seasonings from evaporating so you need to add less salt than usual, too. I use just enough water to cover the food I’m boiling halfway – it takes less time for less water to boil, and the pressure cooker will reach pressure faster than if it were “full” of water.
Most pressure cookers have a “max” line, at approximately 2/3 of the way to the top edge of the pot to indicate the height limit of food an liquid. Following this guide will leave enough room for the pressure cooker to reach pressure and keep the food out of the pressure and safety valves. When boiling beans, grains, rice -or any other food that expands during cooking: never fill the pressure cooker more than half capacity (this limit is usually also indicated inside the pressure cooker).
It is important to note that if you purchased a 5 quart pressure cooker, that is not the maximum capacity, it’s the size of your pan. To figure out the maximum amount of liquid you can put in your pressure cooker, just multiply the stated size by “.66″. So, a 5 quart pressure cooker will be able to cook 3 1/3 quarts of soup. Half capacity, is actually half of 3 1/3 quarts and not half of 5 quarts.
Don’t worry if 5 quarts are starting to sound really small, now. This is the pressure cooker size that is most recommended for beginner pressure cooks, the minimum size for which most pressure cooker recipes are written, and provides abundant food for a family of four. As you will see in the series, and on this website, most recipes will rarely reach maximum capacity and can often be doubled in the “average,” 5 quart, pressure cooker.
Next!
Try the next Beginner Basics Lesson: Naked, Steamy Carrot Flowers - Steaming, High and Low Pressure or view the entire Beginner Basics Course outline!
Now that you can boil in your pressure cooker, you can make…
- Pressure Cooker Boozy ‘Taters
- Sweet and Sour Pearl Onion Antipasto
- Red Wine Stewed Pears (or apples)
- Octopus and Potato Salad
Pssssst! Do you want to learn more about the pressure cookers that I’m using? See them described on my About page!




Great tips for potatoes!
I love that you cooked the potatoes whole and w the peel on, even tho pressure cookers retain vitamins. I like to leave the peels on in mashed potatoes for added vitamins.
You don’t use a trivet? I had a very bad Thanksgiving day, burned potatoes in the p.c. from not adding enough water and will always use a trivet w potatoes now.
Hi JL and HM!
Yes, it’s so easy to toss them in once washed. When I make potato salad, I leave the skins on. When I mash, I take them off.
No, I don’t use a trivet with potatoes. Can’t believe you burned them – that is really hard to do!
Ciao,
L
I have never even thought of doing potatoes in the pc so thanks for the inspiration!
I really prefer my new 6 qt. pressure cooker over my old 8 qt. It is easier to move and it gets to pressure a lot faster.
Nanette, at first I thought you were kidding, then I saw your blog and I realized… you’ve been doing alot more exciting things with your pressure cooker!
L
Your website and beginner basics course has come at the perfect time for me. I was given a pressure cooker at Christmas time and I’m keen to figure out what to do with it. Only one comment about your website is that I don’t seem to be able to copy your recipes so that I can import them into my meal planning & shopping list sofware. Is there something I’m missing?
Hi SME, welcome!
A popular pressure cooking group on Yahoo was copying my recipes and saving them in their file repository without my permission or attribution.
Unfortunately, because of that experience, I had to take more protective measures to ensure that the recipes here are not modified in some unsafe manner or distributed without the descriptions and explanations – that meant removing the ability to copy the text on the website.
However, I am working on a way for the recipes to be printed out more easily.
I hope that will be of some help!
Laura
I got a 6qt Fagor this week. As a married, working father of a 16 month old, the PC is a godsend. This evening I PCed 3 yukon gold for mashing with .5 cups of water and the trivet. It took nearly 20 minutes to get the potatoes cooked. Does this seem right?
Hi Ryan, you are right, 20 minutes is TOO LONG! But three potatoes for two adults and a toddler sounds like they might have been very large.
When you placed the potatoes on the trivet, you steamed instead of boiling them – steaming takes longer due to the indirect contact with water.
The cooking time under pressure also depends on the size of the potatoes. 10 minutes is for medium potatoes that are not longer than the width of the palm of your hand. For larger potatoes, instead of cooking them longer, I would slice them in half. Try to make sure that the potatoes and pieces, if sliced, are approximately the same size so you get even cooking.
Here is your personal checklist for your next potato adventure:
-Check the size of the potatoes and try to make them similar.
-Boil, instead of steaming them, by putting them in the pressure cooker without the trivet and putting water bout half-way up the total height of the potatoes.
-Put the bigger pieces, or potatoes, at the bottom in contact with the bottom of the pan, and the smaller ones on top.
-Check that the pressure cooker is set to “High” pressure or Number “2″.
-Check that the pressure cooker reaches pressure (did the indicator come up?)
-Start counting 10 minutes from the time the cooker has reached pressure – this can take longer depending on how full the pressure cooker is and how much liquid is in it.
Let me know how it worked!
Well, I am very glad that I’ve taken the time to follow your beginner lessons so far. I just received my PC yesterday, started trying it out today, and I can see that there is a pretty good learning curve! I bought a Fagor Futuro set(4&6l), and started out lesson 1 with bringing it up to pressure with water – so far, so good. Then the potatoes – more of a challenge! The first time I brought it up to high pressure on the high burner setting(10 on my stove), then put it on a second burner heated to med-low (2-3) for 10 minutes. Not cooked!? OK, brought it back up to high pressure, but then kept it a little higher at 4. Much better – although overcooked this time as I went for 8 minutes! I can tell that it was under high pressure this time, because when I turned the dial on top from #2 – high, past #1 – low (on the way to the full pressure release) it shot out a good bit of steam at #1 (which it did not do the first time). So, just because I set the dial to #2-high, if I don’t keep it warm enough and listen for just the right soft sigh/puff sounds with the slight steam wisps, it isn’t actually up to high pressure. Now I know, and I know that I have to keep the stove set a little higher than I expected. It is probably due to the fact that it is a glass-top stove, and the heat sort of cycles on and off. I sure am glad that I discovered this before starting straight off into a beef stew, or I’d have been very disappointed. Off to try Lesson 3 – low pressure carrots. Thanks so much for the lessons!
My mom bought me a Fissler vitavit set during our recent vacation in Germany, and I was a bit saddened to find no recipe book inside the box as I am a complete newbie when it comes to cooking of any kind. But now that I’ve found your site I think I will be spending more time in the kitchen! Trying the above mashed potatoes recipe tomorrow. Thank you!
-Mari
Cynthia, did you get a chance to complete the series? So glad to hear that you were able to figure everything out!
Mari, Fissler is working on a recipe book right now. You may be able to contact them at the end of the year to ask if they will send you one – though I don’t know if they will be making one in English!
Ciao,
L
Laura, my husband and I have been cooking avidly for a number of years but just got our first pressure cooker. It’s and electric model. I can’t believe we waited so long! It arrived two days ago, and I decided to use your website to start on this new cooking adventure. The first thing I made was this potato recipe. They turned out perfect. I like to have garlic in my mashed potatoes, so next time I am going to cook a few cloves of garlic in with the potatoes and mash them all together. I’m certain they will cooking nicely in all that steam.
CMY, welcome an congratulations on your new purchase! Garlic sounds like a great addition (I would leave the garlic in the skin during cooking so it doesn’t dissolve completely).
I’m so glad your first recipe was such a succes and I look foward to hearing more about your new adventures in pressure cooking!
Ciao,
L
Hello – just wanted to say thanks for the tip. I’ve been using my pressure cooker for about a year now and I absolutely love it. I had never considered just throwing the potatoes in – skin and all. And, leaving the skins on gave the final product a really yummy flavor of the skins. And, my potatoes came out super light and fluffy. I’m happy to find your website…going to look around now for more recipes = ]
Hi!! I used this recipe today and it turned out wonderful!! Thank you :)
Our Fissler PC has been in the family 20+ years, just received it from
my grandmother as a wedding gift and recently had all the removable parts
exchanged.
LOVE this recipe
LOVE mashed potatoes
easy, quick, and sooooo good!
thanks for keeping this website up!
Anonymoses & Laura, thanks for coming back to leave your feedback!
Ciao,
L
I’ve been cooking my potatoes for mashing in a pressure cooker all my adult life. I cut potatoes into even sized pieces and I make sure none have their cut sides down on the base of the pan. I understood that the water never raises beyond 100 degrees C but the steam – under pressure – does, so the food does not need to be in the water. I use high pressure for 7 minutes and cold water to decrease the pressure. I mash with butter and then use a wooden spoon to beat in some milk if necessary. Maris Piper makes good mash.
The liquid inside the pressure cooker reaches the temperature of 120C or more. It doesn’t “boil” in the traditional sense making bubbles of oxygen that break to the top because of the pressure.
In tests I have done, food cooks slower in the steamer basket than it does boiling in water – but it’s still waaay faster than steaming without any pressure at all!!
Ciao,
L
Hello, I too have been making mashed potatoes in my pressure cooker for years. I just cut them in about 1 inch little cubes, fill it with water to just cover them, cook for 5 min. after the pressure builds up. I use a low pressure cooker. I let the steam out, drain most of the water, whisk it good by hand or an electric mixer and add, butter, salt and milk to taste. Then put the lid on to keep them hot until ready to serve. I like your web site, you have so much information.