Pasta, eggs, potatoes, and bright green vegetables all start with the boiling cooking method, the simplest way to cook in water. A pot of rapidly bubbling water heats food quickly and evenly, and knowing when to keep it boiling and when to turn it down to a simmer makes every one of those dishes turn out better.
Jessica’s Recipe Science
- Water boils at 212ºF (100ºC) at sea level, and turning up the flame won’t make it hotter; the extra heat only makes it boil harder.
- Salt raises the boiling point of water only slightly, a fraction of a degree at the amounts used for cooking, so it seasons food without speeding up the boil.
- Blanching green vegetables in boiling water softens their cell walls and releases trapped air, so the chlorophyll looks brighter green.
Featured Comment 7
“Never have I read such a complete and understandable description of the subject. It’s descriptions like this one that make the reader a better cook.”—Ronald
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What is Boiling?
Boiling is a moist-heat cooking method that cooks food in water or another water-based liquid at its boiling point, 212ºF (100ºC) at sea level. Large bubbles of water vapor rise rapidly and break across the entire surface, keeping the food moving as it cooks.
It’s the hottest of the moist-heat methods. A simmer is a few degrees cooler, about 180 to 205ºF (82 to 96ºC), with small, gentle bubbles, and poaching is cooler still. All that movement makes boiling best for sturdy foods like pasta, potatoes, and eggs in their shells, since delicate foods can break apart.
Boiling at a Glance
| Factor | Details |
|---|---|
| Heat type | Moist heat |
| Temperature | 212ºF (100ºC) at sea level, about 1ºF lower for every 500 feet of elevation |
| What you’ll see | Large bubbles rolling rapidly across the entire surface |
| Cooking liquid | Plenty of water to fully cover the food, usually salted for flavor |
| Best foods | Pasta, eggs, potatoes and root vegetables, grains, rice, and green vegetables for blanching |
| Typical time | 2 to 3 minutes to blanch green beans; 10 to 15 minutes for most pasta and cut potatoes; about 12 minutes for hard-boiled eggs, which finish at a simmer |
| Equipment | A large, heavy-bottomed pot with a lid, a slotted spoon, a colander, and an instant-read thermometer |
Boiling at High Altitude
Water boils at a lower temperature as elevation rises, about 1ºF lower for every 500 feet. At 5,000 feet, it boils at around 203ºF (95ºC), so boiled foods take longer to cook through. Add extra time and test for doneness rather than relying on the clock. Baking at altitude needs adjustments, too; see my guide to high altitude baking.
How to Boil
Boiling takes three steps: bring plenty of water to a rolling boil, add the food so the water keeps bubbling, then cook until it’s done, lowering the heat if the food needs a gentler finish.
Fill the Pot and Season the Water
Use a large pot with enough water to cover the food completely, since the hot water is what cooks it. For pasta, I use 4 quarts of water per pound.
Season the water with salt for flavor; for pasta, I add 1 tablespoon of kosher salt to 4 quarts of water. Salt won’t make the water boil faster, though. It raises the boiling point only slightly, a fraction of a degree, so it’s there to season the food.
Bring It to a Rolling Boil
Cover the pot to bring the water up to a boil faster, since the lid traps heat. Once large bubbles roll across the entire surface, the water has reached its boiling point. It can’t get any hotter than 212ºF (100ºC) at sea level, so turning up the heat further only makes it boil harder.
An instant-read thermometer confirms the water temperature and checks the internal temperature of foods like meat and poultry.
Add the Food and Keep It Boiling
Add pasta, grains, and green vegetables to water that’s already boiling. Add them a little at a time so the water doesn’t cool down too much and stop boiling, and stir pasta a few times so the pieces don’t stick together.
Dense root vegetables like potatoes, carrots, beets, and turnips are the exception. Start them in cold water and bring it up to a boil together, so the outside doesn’t overcook before the center is tender.
Turn It Down When Needed
Many foods start at a boil and finish at a simmer. Eggs, potatoes, and dried beans cook more gently once the water is hot, and a hard, rolling boil can knock eggs into each other and break potatoes apart.
Best Foods for Boiling
Boiling is best for sturdy foods that can handle the movement of a rolling boil.
Pasta
Boil pasta in plenty of salted water until al dente, or “to the tooth,” with a little resistance left in the center. A strong boil keeps the pieces moving so they don’t stick together. Learn how to cook pasta like a pro, then try my Cajun shrimp pasta or chicken and broccoli pasta.
Eggs
For eggs in their shells, bring the water to a boil, then lower it to a gentle simmer: about 5 to 8 minutes for soft-boiled eggs and 12 minutes for hard-boiled eggs. You can also make them in the Instant Pot.
Potatoes and Root Vegetables
Start potatoes, sweet potatoes, carrots, beets, turnips, and rutabagas in cold water. Cooking times vary with their size and density, so check with the tip of a sharp knife; when it slides in easily without much resistance, they’re done. Try my boiled sweet potatoes, mashed potatoes, or American potato salad.
Green Vegetables
Blanching cooks green vegetables in boiling water for just a few minutes, then stops the cooking in an ice bath to keep them crisp and bright green. Green beans take 2 to 3 minutes. The same quick boil works for broccoli and spinach.
Grains and Rice
Spelt, farro, quinoa, millet, and wheat berries all cook up beautifully in boiling water; each has its own cooking time, so check the package. Some rice can be boiled freely in plenty of water and drained, while others need an exact rice-to-water ratio. Brown rice, wild rice, and black rice all take longer than white rice.
Sauces and Reductions
Because boiling evaporates liquid quickly, it’s the fastest way to reduce a sauce and concentrate its flavor. A splash of wine or stock boiled down in the pan you cooked in becomes the base for a rich pan sauce or gravy.
Advantages and Disadvantages of Boiling
Advantages
- Simple: All you need is a pot, water, and heat.
- Fast: It’s the hottest moist-heat method, so green vegetables blanch in minutes and pasta cooks in about 10.
- Great for big batches: A large pot handles a lot of food at once, which makes boiling ideal for cooking for a crowd.
- No added fat: Food cooks in water, so it keeps its natural flavor without oil or butter.
Disadvantages
- Too rough for delicate foods: The rolling bubbles can break apart fish and other tender foods, so poach or simmer them instead.
- Easy to overcook: Vegetables boiled too long turn soft and lose their bright color.
- Flavor goes into the water: Unless you serve the cooking liquid, as in soup, some flavor is poured down the drain.
- Toughens meat: A hard boil tightens the muscle fibers in meat and poultry, so simmer tough cuts instead.
Recipes That Use Boiling
Put the boiling method to work with these reader favorites, or try my corn on the cob for an easy summer side.
Frequently Asked Questions
Water boils at 212ºF (100ºC) at sea level. At higher elevations, it boils at a lower temperature, about 1ºF lower for every 500 feet, or around 203ºF (95ºC) at 5,000 feet.
No. Salt raises the boiling point of water slightly, by only a fraction of a degree at the amounts used for cooking. Add salt for flavor; to bring water to a boil faster, cover the pot.
Boiling happens at 212ºF (100ºC), with large, rolling bubbles that move food around. Simmering is a few degrees cooler, about 180 to 205ºF (82 to 96ºC), with small, gentle bubbles.
Put the lid on to bring water to a boil faster, since it traps heat. Once you add food like pasta, cook it uncovered so the pot doesn’t boil over.
Boiling is a moist-heat cooking method, because the food cooks in hot liquid.
Pasta, eggs, potatoes and other root vegetables, grains, rice, and green vegetables like green beans and broccoli are all commonly boiled.
Tools for Boiling
- Stockpot: A large, heavy-bottomed pot, like my All-Clad stockpot, holds plenty of water, so it stays at a boil when you add the food.
- Slotted spoon: Lift eggs, vegetables, and dumplings out of the water and leave the hot water behind.
- Colander: Drain pasta, potatoes, and blanched vegetables quickly so they stop cooking.
- Instant-read thermometer: Check the water temperature and the doneness of meat and poultry. Read more about choosing a thermometer.
Find all of my favorite kitchen tools on my Shop page.
Some of the links above are affiliate links, which pay me a small commission for my referral at no extra cost to you! Thank you for supporting my website.
Sources: America’s Test Kitchen (boil vs. simmer); USDA Food Safety (high-altitude cooking); University of Illinois (salt and boiling point).
More Cooking Method Guides
Learn how each technique works and when to use it, or start with the types of cooking methods overview:
Moist heat: Poaching · Simmering · Boiling · Steaming · Blanching
Combination heat: Braising · Stewing
Dry heat: Roasting · Baking · Sautéing · Pan Frying · Stir Frying · Deep Frying · Grilling · Broiling · Searing
Tatiane says
Hi Jessica! Adding some water-soluble substance like salt or sugar to the liquid raises the boiling temperature and turn the process slower, not faster as said in the text.
Nwoye Sandra says
What is the difference between boiling and cooking
M Loosli says
Once the water reaches a boil is it good to turn down the boil…does it use less energy? Does a slow boil affect the food rather than a strong boil? I appreciate that you will help us learn the science behind this cooking method.
Jessica Gavin says
I always keep an eye on the water and adjust the heat as needed. How much movement in the pot will affect the ingredient. Depending on what you are cooking you want a strong boil or simmer for longer cooking times. For example, I want a strong boil to cook pasta so they don’t stick together and cook all the way through, cooking a soup I would want a low boil or simmer.
Ogbu Samuel says
Thank you Jessica for your simple cooking methods God bless you
Ronald F. Seto says
Thank you Jessica for the great treatise on boiling. Never have I read such a complete and understandable description of the subject. It’s descriptions like this one that make the reader a better cook. You and Alton Brown are my two favorite cooks.
I hate cooks that just present recipes and don’t explain the cooking process. There are/were cooks that do well in explaining the cooking process; Julia Child was one of them. Martin Yan was pretty good at it also. I would be interested in hearing your opinions on cooks I’ve just mentioned.
As an amateur cook myself, I try not to depend too heavily on cook books. Once I understand the process, I go ahead and cook whatever I like, using seasonings I like. I try to create a taste that is slightly above the “bland” level of taste. I cook primarily to suit my taste, but not to the extreme. I want my cooking to appeal to as many people as possible. To my family, they pretty much enjoy my cooking. my father was Chinese, so I inherited a taste for good food.
Jessica Gavin says
Thank you Ronald for making my day, you motivate me to keep cooking and sharing! My goal is to help others gain confidence in the kitchen, beyond just recipes, and your feedback is so reassuring. I grew up watching Julia Child’s and Martin Yan, entertaining and so knowledgeable. You approach to cooking is fantastic and I love that you share your passion with others. Cheers!