Emilie Meyer
When cooking, it is important to know when to cover a pan with a lid or alternative covering, and when to leave it uncovered. Covering a pan can help to trap heat and moisture, which is essential for cooking methods such as braising and steaming. However, leaving the lid off can also be beneficial, especially when trying to reduce a sauce or create a crispy, fried texture. In addition to traditional lids, there are several alternatives that can be used to cover a pan, including foil, parchment paper, a frying pan, a baking sheet, a splatter shield, or a plate.
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What You'll Learn
When to cover a pan
While some recipes specify whether to cover a pan or not, there are a few guidelines that can help you decide when to cover a pan. Firstly, if you want to bring something to a simmer or a boil, keeping the lid on helps for two reasons. It prevents heat from escaping through an open lid, thus reducing the time it takes for the water to boil. Secondly, it minimises water loss through evaporation, ensuring that the original volume of water is largely retained. Therefore, keeping the lid on is ideal when you want to keep the heat and moisture in, such as when cooking soups, stews, or sauces.
On the other hand, leaving the lid off is recommended when your goal is to reduce moisture in the pan. This is crucial when trying to achieve a crispy, fried texture during stir-frying or deep-frying. The presence of moisture can cause steam to condense and drip back into the hot oil, leading to popping and splashing. Similarly, when searing steaks, duck breasts, lamb chops, or tuna, keeping the lid off is essential to prevent steam from interfering with the formation of a crisp, caramelized crust.
When braising tougher cuts of meat, such as brisket, chuck, pork shoulder, or short ribs, it is advisable to keep the lid on. Braising requires moist heat over an extended period to break down collagen and connective tissues, resulting in tender meat. The lid ensures that the meat is continuously bathed in steaming and simmering liquids, infusing flavour back into the dish. Similarly, steaming vegetables, tamales, seafood, or grains requires the lid to be on to trap heat and moisture, cooking these foods to tenderness without drying them out.
In situations where a pan lid is unavailable, alternatives such as foil, parchment paper, a frying pan, or a baking sheet can be used as a cover. Using two sheets of foil or a double layer of parchment paper ensures a tighter seal, helping to retain steam and moisture. However, when frying an egg, it is recommended to leave a small gap for steam to escape, preventing the egg from overcooking.
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When not to cover a pan
While covering a pan can be useful in many situations, there are also times when it is best to leave the lid off. Here are some instances when you should not cover a pan:
When Searing Meat
Searing meat involves cooking it in a very hot pan to create a flavorful, caramelized crust on the exterior. When searing steaks, duck breasts, lamb chops, tuna, salmon, or other types of meat, it is important to leave the lid off the pan. Moisture is the enemy of searing, as it creates steam and prevents the formation of a crisp coating.
When Frying
Whether stir-frying, deep-frying, or pan-frying, it is generally best to leave the lid off the pan. All foods release steam when cooking, and this steam can condense on the lid and drip back into the hot oil. This not only interferes with achieving a crispy, fried texture but can also cause popping and splashing, creating a dangerous situation. Leave the lid off to allow the steam to escape and prevent moisture from collecting in the pan.
When Reducing Liquids
When reducing or thickening liquids such as sauces or gravies, it is advisable to leave the pan uncovered. By leaving the lid off, you allow excess liquid to evaporate, resulting in a thicker, more concentrated sauce. Covering the pan will cause the steam to condense and drip back into the sauce, slowing down the reduction process.
When Cooking Crispy Potatoes
To achieve crispy fried potatoes, a two-step process is ideal. First, cook the potatoes uncovered to achieve a browned exterior. Then, cover the pan for the second part of cooking to steam the inside, resulting in a soft, tender texture. Leaving the pan uncovered throughout the cooking process may result in a crispy exterior but may not allow enough time for the interior to cook thoroughly.
When Cooking Without a Lid for Specific Textures
In some cases, you may want to cook without a lid to achieve a specific texture. For example, when making a grilled cheese sandwich, covering the pan for the entire cooking time can make the bread soggy. Instead, cover the pan only for the first half of cooking to melt the cheese, then uncover to allow the bread to toast and become crispy. Similarly, when frying an egg, cover the pan for only part of the cooking time to allow the steam to cook the top without flipping it over and risking breaking the yolk.
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Using a netted cover to retain heat
Using a netted cover can help retain heat and moisture in the pan. While some recipes specify whether to cover the pan or not, there are some general guidelines to follow. If you are trying to bring something to a boil, cover it with a lid to speed up the process and save energy. Similarly, if you want to retain moisture while cooking, such as steaming vegetables or seafood, cover the pan to trap the heat and moisture inside. Braising, which requires moist heat over a long period, also calls for covering the pan.
On the other hand, if you are trying to achieve a sear or a crispy texture, leave the lid off. Moisture can prevent the formation of a crispy coating and create steam that dilutes any browning achieved. When trying to thicken a soup or sauce, leave the lid off to allow evaporation and concentration of flavours.
If you don't have a lid, alternatives such as a double sheet of foil or parchment paper can be used to cover the pan. A fine-mesh strainer can also be used as a netted cover, providing protection from splattering oil. However, these alternatives may not provide a tight seal, so they may not be suitable for certain dishes like steaming rice.
Additionally, when using a netted cover, be mindful of the material it is made of. For example, if using a silicone lid with a "flappy bit" to release steam, avoid metal utensils that can damage it.
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Using alternatives to a netted cover
When it comes to covering a pan, a netted cover is not the only option. Here are some alternatives to consider:
Using Another Pan or a Universal Lid
If you have a pan that is roughly the same size or a little larger, you can flip it upside down and place it on top of the pan you are using. By turning the handle to the side, you can minimise the escape of steam. If you have a smaller pan and are cooking a small amount of food, you can simply bunch the food to one side and lay the smaller pan over it. Alternatively, you can use a universal lid, which has grooves that grip the sides of the pan.
Aluminium Foil or Parchment Paper
Two sheets of aluminium foil can be used to cover the pan by scrunching them around the sides. This method allows you to easily lift the foil to check on the food and then lay it back down. However, be cautious when handling hot foil to avoid burns. Parchment paper can also be used in a similar way, placed on top of the dish to provide a close fit and minimise moisture escape.
Baking Sheet
A clean baking sheet can be laid on top of the pan to retain steam and moisture. Just ensure that the ingredients do not come into contact with the baking sheet.
Splatter Shield or Fine-Mesh Strainer
A splatter shield can be placed over the pan to protect you from hot oil splatters. If the size is not a perfect fit, hold it in place by the end of the handle. Alternatively, a fine-mesh strainer with a long handle or heat-proof grips can be used for safety and ease of handling.
Covering Specific Foods
For frying an egg, cover the pan partially after the whites start to firm up. This allows the steam to cook the top without flipping the egg. When cooking chicken or fish, cover the pan for the first half of cooking to ensure the inside is cooked before removing the lid and increasing the heat to crisp the outside.
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Safety precautions when covering a pan
Safety should always be a priority in the kitchen. Here are some precautions to take when covering a pan:
Use the Right Tools
If you're using a netted cover, ensure it is made from a heat-resistant material and has a long handle or heat-proof grips so you can easily lift it without burning yourself. If you're using a universal lid, ensure it has grooves that grip the sides of the pan to prevent it from sliding off.
Prevent Steam Burns
Covering a pan can cause steam to build up, leading to popping and splashing when the lid is removed. Always open the lid away from you to avoid steam burns. When frying, it's best to leave the lid off to prevent steam from condensing and dripping back into the hot oil, which can cause dangerous popping and splashing.
Avoid Oil Splatters
Oil splatters can cause a mess and potentially lead to burns. If you're pan-frying, consider using a splatter shield or a fine-mesh strainer with a long handle to protect yourself from hot oil splatters.
Handle with Care
When using foil or baking sheets to cover a pan, be cautious of the escaping steam and hot surfaces. Use oven mitts or towels to protect your hands when handling hot items, and be mindful of the steam release when lifting the cover.
Know When to Cover
While covering a pan can help retain heat and moisture, there are times when leaving the lid off is essential. When searing, stir-frying, or deep-frying, keep the lid off to prevent moisture buildup, which can interfere with achieving a crispy, caramelized texture.
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Frequently asked questions
You can use a double sheet of foil, a universal lid, a frying pan of roughly the same size, a splatter shield, a fine-mesh strainer, or a plate (ceramic, enamelled, or metal).
Cover your pan with a lid when you want to keep heat and moisture in, such as when braising, steaming, or boiling.
Leave your pan uncovered when you want to reduce the moisture level, such as when searing, stir-frying, or deep-frying.
