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

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" How does cornstarch work ? "

Dear Anne and Sue,

OK, so what's the deal with cornstarch? Why, when it's supposed to thicken, does it sometimes seem to go the opposite way and make stuff runnier? How does cornstarch work?

Thank you,
Dallas R.
Calgary, AB

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

( Meet the Inquisitive Cooks )

Hi Dallas,

As you've discovered, starches are sometimes noted for their idiosyncrasies! Cornstarch is one of the most commonly used thickeners, but it has some unique traits. So thanks for the good question!

Cornstarch must be cooked to 95°C (203°F) before thickening begins. At that point, it usually thickens fairly quickly and the sauce turns from opaque to transparent. When cornstarch thins after it's thickened, it's usually due to continued stirring. Once the thickening network forms, any agitation interferes with the setting process. The sauce thins when the starch network that sets and traps the liquid is broken. Liquid is released and thins the sauce.

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While cornstarch thickens as it heats, it also sets as it cools, so it's particularly useful as a gelling agent for desserts that must hold their shape such as lemon pie filling. Also, as cornstarch becomes clear when thick, while flour remains somewhat opaque, the color of fruit sauces is deeper and more appealing when those sauces are thickened with cornstarch. Cornstarch also sometimes appears to thin as it stands. This is due to a process called syneresis (commonly referred to as weeping). What you'll see is a fluid seeping from the gel. This problem is more evident if the gel (often a pudding or pie filling) also contains eggs or has a high sugar concentration. People often wonder what the difference is between cornstarch and flour. Both are cereal starches, but cornstarch is pure starch while flour contains gluten. The gluten reduces the thickening power of flour. One tablespoon of cornstarch thickens one cup (250 mL) of liquid to a medium consistency. It takes two tablespoons of flour—twice as much—to thicken the same amount of liquid.

Your query really brings up the point that there's a lot to learn about the thickeners that cooks use every day. Wishing you successful sauces!

Anne & Sue

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

FAQs

What is the scientific approach to cooking? ›

Molecular gastronomy is the scientific approach of cuisine from primarily the perspective of chemistry.

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

Is cooking chemistry or physics? ›

For example, the art of cooking itself is chemistry; we use various processes, including heating up and freezing food, adding spices to your favorite dish, browning bread, and more. Chemistry is an essential component in the kitchen.

What is the basic science behind cooking? ›

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 is the science of cooking called? ›

Molecular gastronomy, or progressive cuisine, is a movement that incorporates science and new techniques in the preparation, transformation and artistic presentation of food. It is the study of molecules as they relate to the chemical and physical processes of cooking.

What is the first principle of cooking? ›

It's a way of thinking, an ability to see that everything you do from the moment you step into the kitchen to the last dish you dry is part of a single, simple process. You realize that the “perfect” way to prepare any dish is whatever happens to work with you and your meal.

Is cooking an exact science? ›

Cooking is flexible, while baking is precise

And while all cooking is scientific, it's true that baking relies on pure scientific precision to create a great dish.

What is the science of cooking techniques? ›

Convection
  • Convection can be as simple as stirring a pot on the stove.
  • Hot air in an oven creates movement either through a natural or a fan-forced process.
  • Boiling, simmering, or steaming creates movement through the heating and condensation of water.
  • Deep-frying in oil is a convection process similar to boiling water.

What is the best question to ask a chef? ›

Chef Interview Questions to Assess Background and Skill Level
  • Tell me about any formal training you've received.
  • Do you have any relevant industry certifications?
  • Where did you receive the most hands-on training?
  • Have you ever been responsible for creating or updating menus?

What are basic questions to ask? ›

Here are 10 conversation starters you can use to stimulate a conversation with someone new:
  • How do you spend your free time?
  • What's your favorite food?
  • Do you listen to any podcasts?
  • Have you heard of [movie or TV show you enjoy]?
  • What's your favorite thing to do on the weekend?
  • Do you have any pets?

What is the science involved in cooking? ›

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 behind food? ›

Food Science is a multi-disciplinary field involving chemistry, biochemistry, nutrition, microbiology and engineering to give one the scientific knowledge to solve real problems associated with the many facets of the food system.

Is cooking an art or science? ›

Cooking, also known as cookery or professionally as the culinary arts, is the art, science and craft of using heat to make food more palatable, digestible, nutritious, or safe.

Can cooking be a scientific method? ›

If a cook draws on the scientific knowledge of an expert for guidance, there may be a scientific mindset in their cooking. There is also a parallel between the order of scientific method and that of culinary method, both of which are focused on producing results.

What is scientific method in food? ›

Nutritional scientists discover the health effects of food and its nutrients by first making an observation. Once observations are made, they come up with a hypothesis, test their hypothesis, and then interpret the results.

What is the scientific definition of cooked? ›

In scientific terms, cooking is transferring energy from a heat source to the food. It is as much about the ways ​heat changes the food as it is about the heat itself.

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