This simple technique is commonly used by home cooks and professional chefs.

6. A Green Ring Around the Yolk Is Usually Harmless

Sometimes a hard-boiled egg develops a grayish-green ring around the yolk.

Although this may look strange, it is generally harmless. The color develops when sulfur compounds in the egg white react with iron in the yolk during prolonged cooking.

The green ring does not normally mean that the egg has spoiled.

To reduce the chance of developing this ring, avoid overcooking the eggs and cool them promptly after boiling.

7. Hard-Boiled Eggs Can Be Stored for Several Days

Properly refrigerated hard-boiled eggs can generally be stored for about a week.

Keeping the eggs in their shells until you are ready to eat them can help maintain their quality.

However, eggs should be refrigerated promptly after cooking and should not be left at room temperature for long periods.

When in doubt about whether an egg has been stored safely, it is better not to eat it.

8. Hard-Boiled Eggs Are Extremely Versatile

Hard-boiled eggs can be used in many different meals.

They can be added to:

• Salads
• Sandwiches
• Soups
• Grain bowls
• Appetizers
• Potato salads

Their mild flavor makes them easy to combine with vegetables, sauces, grains, and other foods.