Boiled egg

Boiled eggs are a yummy food.

You cook them in hot water. Some eggs stay soft inside.

Other eggs get hard. This happens because heat changes the egg.

Hard eggs are good for salads. People also use them in sandwiches. You can even slice them with a tool.

Soft eggs have a runny yolk. You can dip toast into them. These toast strips are called soldiers.

In Japan, eggs are put in ramen. They soak in soy sauce. This makes the eggs look brown.

Some eggs are special too. In Japan, eggs cook in hot springs. This makes the shells turn black.

Boiled eggs are fun to eat!

Boiled eggs are a popular food for breakfast. People cook them in their shells. Usually, they put the eggs in boiling water.

How you cook them changes how they feel. Hard-boiled eggs are cooked for about ten minutes. Both the white and the yolk become solid. You can eat them warm or cold. They are great in egg salad or sandwiches.

Soft-boiled eggs have a runny yolk. This makes them taste sweet and rich. In the United Kingdom, people eat them with toast strips. These toast strips are called "soldiers."

Some eggs are very special. In Japan, eggs can be boiled in hot springs. This makes the shells turn black. These are called Kuro-tamago.

In Japan, eggs are also a part of ramen. They soak in soy sauce and mirin. This gives the egg a brown color. Cooking eggs is a science. Heat changes the proteins inside the egg. This makes them go from liquid to solid.

Boiled eggs are a favorite breakfast food all over the world. Most people make them by putting chicken eggs into boiling water while the shells are still on. You can choose how you like your egg to feel by changing the cooking time. Hard-boiled eggs are cooked for about ten minutes until the white and the yolk are both solid.

Soft-boiled eggs are cooked for less time, which leaves the yolk runny and sweet. Some people even use special tools like egg cups or egg scissors to eat them.

Cooking an egg is actually a very interesting science. Inside the egg, there are proteins called albumin in the white and proteins in the yolk. When heat touches them, these proteins denature and solidify. This is called coagulation. The egg white starts to turn solid at a lower temperature than the yolk. Because the white surrounds the yolk, the heat takes longer to reach the center. This makes it very hard to make an egg with a solid white and a runny yolk at the same time.

People have been eating eggs for a very long time. They have been part of human history for as long as people have kept domestic chickens. We can find recipes for boiled eggs in the first known cookbook called De re coquinaria. In that old book, one recipe even uses preserved boiled eggs. A famous writer named Alexander Pope once suggested cooking eggs over the hot ashes of a fire.

There are many different ways to enjoy eggs in different cultures. In Japan, people eat eggs in ramen that have been soaked in soy sauce and mirin. This gives the egg a beautiful brown color.

In the Kanagawa Prefecture of Japan, people boil eggs in hot spring water to make Kuro-tamago. These special eggs have shells that turn black from the minerals. In the United Kingdom and Australia, people eat soft eggs with toast strips called "soldiers." In Southeast Asia, half-boiled eggs are often served in a bowl with soy sauce and pepper.

Sometimes, making the perfect egg requires a few extra steps. If you cook a hard-boiled egg for too long, a green coating can appear on the yolk. You can stop the cooking by rinsing the egg in cold water right after it is done. Some people also use a machine to make "long eggs" which are shaped like a cylinder. In China, duck eggs can be preserved in salt or brine for 20 to 50 days before being boiled. Whether they are part of a fancy aspic or a simple snack, boiled eggs are a wonderful part of many meals.

Boiled eggs are a versatile food item made primarily from chicken eggs. The cooking process usually involves immersing the eggs in boiling water while the shells remain unbroken. This simple method can produce very different results depending on the time spent in the heat. Hard-boiled eggs are cooked until both the white and the yolk are completely solid. Soft-boiled eggs are cooked for a shorter duration, leaving the yolk partially or fully liquid.

This culinary staple is a popular breakfast food across many different global cultures.

The science of boiling an egg is based on the behavior of proteins. Inside the egg, proteins in the white, called albumin, and proteins in the yolk undergo a process called denaturation. This process causes the proteins to unfold and then bond together, a stage known as coagulation. As the proteins coagulate, they solidify the liquid contents. The egg white begins to coagulate at a lower temperature range than the yolk. The yolk requires a slightly higher temperature to thicken and eventually solidify.

Because the albumin surrounds the yolk, heat must travel through the white to reach the center. This makes it difficult to achieve a perfectly solid white alongside a runny yolk.

There are several distinct ways to categorize boiled eggs based on their texture. Hard-boiled eggs are typically cooked for about 10 minutes. These are often used as ingredients in dishes like egg salad, Cobb salad, or Scotch eggs. They can also be prepared as deviled eggs. Soft-boiled eggs offer a different experience with a creamy, sweet, and umami-rich yolk. In the United Kingdom and Australia, people eat soft-boiled eggs with toast strips called "soldiers."

In Southeast Asia, a variation called half-boiled eggs is served in a bowl with soy sauce and pepper.

History shows that humans have used eggs for a very long time. The history of eating eggs follows the history of the domestic chicken. We find recipes for boiled eggs in *De re coquinaria*, which is the first known cookbook. This ancient text even includes a recipe using preserved boiled eggs. The poet Alexander Pope once recommended cooking eggs over the embers or ashes of an open fire.

These historical methods highlight how central eggs have been to human nutrition for centuries.

Different regions have developed unique methods to change the flavor or appearance of boiled eggs. In Japan, eggs are often served in ramen after being steeped in a mixture of soy sauce, mirin, and water. This process gives the eggs a distinctive brown color.

In the Ōwakudani region of Japan, eggs are boiled in mineral-rich hot spring water to create *Kuro-tamago*. These eggs are famous for their characteristic black shells. In China, duck eggs may be preserved in salt or brine for 20 to 50 days before being boiled. These salted eggs represent a specific method of food preservation.

Precision in cooking can prevent common issues like discoloration. If an egg is overcooked, a thin green iron(II) sulfide coating may form on the yolk. This happens more quickly in older eggs because their whites are more alkaline. To prevent this, cooks often rinse or immerse the eggs in cold water immediately after boiling. This "shocking" process halts the cooking.

For those who want a specific shape, machines can produce "long eggs." These are eggs where the yolk and white are separated and poured into a cylindrical mold. This method was first introduced in 1974 and is used commercially in Denmark and Japan.

Boiled eggs also connect to broader topics like food safety and chemistry. To destroy harmful bacteria like *Salmonella*, the egg must reach a specific temperature. While some believe complete coagulation is the only way to ensure safety, temperature is the most critical factor. Additionally, the ease of peeling an egg is tied to its chemical makeup. As an egg ages, it loses carbon dioxide through its pores, making the pH of the white more basic. This higher pH makes the egg less likely to stick to the shell, making it easier to peel.