Science of Cooking: Ask the Inquisitive Cooks! (2024)

Science of Cooking: Ask the Inquisitive Cooks! (1)

" What is the difference between a pressure cooker and a slow cooker? "

Hello. Please tell me the difference between a pressure cooker and a slow cooker. Which one I should use to cook very tough meat? Thank you.

—Lesley Just, Dar es Salaam, Tanzania

Still have more questions? You'll find more answers in our archived monthly feature articles by the Inquisitive Cooks.

( Meet the Inquisitive Cooks )

Hi Lesley,

Both slow cookers and pressure cookers do a good job of tenderizing tough meat, but each makes meat more edible in a different way.

A pressure cooker is an enclosed pot with a lid that locks to form an airtight seal. When a small amount of liquid inside the pot boils and produces steam, the pressure cooker traps the steam inside. As pressure builds, water boils at higher and higher temperatures. At 5 pounds pressure, water boils at about 228 °F (108 °C). At 15 pounds pressure, the boiling temperature rises to 250 °F (121 °C). When you consider that water usually boils at 212 °F (100 °C) and the food inside a pressure cooker is at much hotter temperatures than normal simmering will allow, it's not surprising that food cooks quickly.

Science of Cooking: Ask the Inquisitive Cooks! (2)

There's another aspect of pressure cookers to consider too. Steam penetrates food easily under pressure. So connective tissues in cubes of beef for soups or stews soften in 15 minutes or less, and a pot roast will be medium-rare in 30 minutes.

Be sure to follow instructions carefully; at this speed, it's easy to overcook things in mere minutes. You may find that flavors aren't as fully developed as when tough meat simmers in a slow braise But you do save a lot of time.

A slow cooker is a countertop appliance—basically an electrified pot with a lid that's designed to cook at low temperatures for long periods of time. Though very different from a pressure cooker, slow cookers are also good for tough cuts of meat. It's best to begin on the highest setting for the first hour of cooking (to raise the temperature quickly) and then reduce the setting to low. Slow cookers work well for soups and stews where less-tender cuts of meat are cut into chunks or small pieces. They are not appropriate for large pieces of meat such as roasts, as the heat penetrates too slowly to ensure safety.

So how does slow cooking tenderize? Broth, water, or juices are always added along with the meat. The moist heat they provide softens the connective tissue that binds the muscle fibers in the meat, helping it to fall apart more easily. And when the heat is kept low, as it is in slow cooking, the proteins in the muscle are less likely to overcook, so the meat stays moist as well as tender. Flavors are also more developed, but the process takes considerable time.

If you have a pressure cooker and a slow cooker, we encourage you to try both. We'd be interested in your results and comments, as would many members of our Forums.

Anne and Sue

Science of Cooking: Ask the Inquisitive Cooks! (3) Science of Cooking: Ask the Inquisitive Cooks! (4) Science of Cooking: Ask the Inquisitive Cooks! (5)
Science of Cooking: Ask the Inquisitive Cooks! (2024)

FAQs

What is the science behind cooking food? ›

One of the most important chemical reactions that occur during cooking is the Maillard reaction. This is what happens when you heat food and it browns on the outside. In the Maillard reaction, the heat allows amino acids to react with reducing sugars.

What are the scientific principles of cooking? ›

Let's take a closer look at a few reactions between heat and food and discover the scientific principles behind some of our favorite dishes.
  • Maillard Reaction: The Browning Magic. ...
  • Protein Denaturation: Changing Structures. ...
  • Gelatinization: The Science of Starch. ...
  • Caramelization: Sugars at Work. ...
  • Cooking Oil and Heat Transfer.
Oct 6, 2023

How does cooking affect connective tissues? ›

The relevance of connective tissue to cooking is that collagen dissolves in hot water, so less tender cuts where connective tissue is well developed benefit from cooking with moisture. In contrast, fibers of elastin are not tenderized by moist heat, and therefore remain tough.

Is culinary chemistry a real thing? ›

Chemistry and cooking go hand in hand – cooking is chemistry. Think about it: when you're heating up your food, you're killing harmful bacteria and microorganisms. When you add spices or transform ingredients in any way, shape, or form, this is a chemical process. You may not realize it, but chemistry is cooking!

What is the science behind food? ›

What is Food Science? Food science draws from many disciplines, including biology, chemical engineering, and biochemistry to better understand food processes and improve food products for the general public. As the stewards of the field, food scientists study the physical, microbial, and chemical makeup of food.

What is the science of cooking called? ›

molecular gastronomy, the scientific discipline concerned with the physical and chemical transformations that occur during cooking.

Is cooking an exact science? ›

All cooking is scientific in nature, but with baking there is a very specific scientific interplay between ingredients.

What are the physics of cooking? ›

The product of time, temperature and nature of medium used for cooking can decide the quality of food. Understanding the concept of thermal conductivity, specific heat and thermal diffusivity can lead to optimized time of cooking.

What are the three principles of cooking? ›

  • Dry-heat cooking- use air or fat.
  • Moist –Heat Cooking – use water or steam.
  • Combination Cooking – combine dry and moist heat together.

What cuts of meat are high in collagen? ›

Meat on bones, such as ribs, oxtail, wings, drumsticks and shanks, contains collagen-rich connective tissues and cartilage. These cuts require slow cooking methods like braising, stewing, or roasting to break down the collagen and create tender, flavorful meat.

At what temperature does fat melt? ›

Fats are crucial to meat texture. Waxy when cold, fats start to melt around 130°F to 140°F, lubricating muscle fibers just as they are getting tougher and drier from the heat. Fat does not evaporate like water when you are cooking.

What temperature breaks down collagen? ›

To keep track of a low and slow cook, you really need a thermometer, and you need a thermometer that you can leave in your food. Collagen dissolution really gets going starting at about 170°F (79°C). But as it takes a long time for those helixes of protein to unwind, it's better to get the temperature a little higher.

How does cooking work scientifically? ›

Any cooking you do involves chemistry. The use of heat, cold, and cutting changes the composition of foods. Even simply slicing an apple sets off chemical reactions that change the color of the apple's flesh. If you heat up sugar to turn it into syrup, you're using a chemical reaction.

What is the science of eating called? ›

Food science is the basic science and applied science of food; its scope starts at overlap with agricultural science and nutritional science and leads through the scientific aspects of food safety and food processing, informing the development of food technology.

What chef uses science to cook? ›

Heston Marc Blumenthal OBE HonFRSC (/ˈbluːməntɔːl/; born 27 May 1966) is an English celebrity chef, TV personality and food writer. Blumenthal is regarded as a pioneer of multi-sensory cooking, food pairing and flavour encapsulation.

What is the chemistry behind food science? ›

Food chemistry is one of the fields involved in the multi-disciplinary field of food science. It is the study of food components, such as proteins, carbohydrates, fats, and water. In addition, food chemistry assesses the reactions these components go through during food processing and preservation.

What is the cooking show about the science of cooking? ›

Chef Secrets: The Science of Cooking.

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