How to Freeze Leeks

Remove the roots and excess stem. Start by cutting off the roots at the base of the leek (at the white bulb's end), as well as the dark green part at the top of the leek. When trimming the green portion, leave a little bit of the green stem above the white bulb.

• If desired, you can save the dark green part to add to soups or broths.

Wash the outside of the leeks. After trimming, give the leeks a quick rinse under cold water to remove dirt and dust from the outer layers. During their growth, dirt and sand often get trapped between the layers of the leek. Before freezing, you need to ensure the leeks are thoroughly cleaned.

Cut the leeks in half or quarters lengthwise. Place the leeks on a cutting board or plate and use a sharp knife to slice them lengthwise in half. If desired, you can further split each half into quarters.

• If you prefer, you can also cut the leek segments crosswise into smaller pieces.

Rinse the leeks under running water. Wash each leek segment under the tap, gently separating the layers with your fingers to remove any remaining dirt or debris.

• If you’ve cut the leeks into smaller pieces, place them in a bowl of cold water and stir. After rinsing, use a slotted spoon to transfer the leeks to a dry bowl.

Find a large pot and a metal blanching basket. While blanching is not necessary before freezing leeks, it can help preserve their freshness and flavor for a longer period. You will need a large pot and a blanching basket or a pasta strainer.

• If you don’t have a blanching basket, you can use a cooking mesh bag instead.
• If you choose not to blanch, try to use the leeks within 1-2 months of freezing.

Add water to a pot and bring it to a boil. Pour a small amount of water into the pot and adjust the stove to high heat until the water starts boiling. Use 4 liters of water for 0.5 kg of prepared leeks.

Place the leeks in a blanching basket and immerse them into the pot. Put the cleaned and chopped leeks into a blanching basket or mesh bag. Submerge the basket and leeks into the boiling water.

Cover the pot immediately once the water starts boiling again. The water might temporarily stop boiling when you add the leeks. Wait until the water starts boiling again, and then cover the pot immediately.

Soak the leeks in the boiling water for about 30 seconds. Start timing once the water has resumed boiling. Keep the leeks in the pot with the lid on for at least 30 seconds but no longer than 1-2 minutes.

Remove the blanching basket and quickly submerge the leeks in cold water for 1-2 minutes. Take the leeks out of the pot, drain them, and swiftly place them in a bowl of cold water. The goal of blanching is to stop the enzymatic activity in the leeks without cooking them. To prevent the leeks from cooking, you must immediately dip them in cold or ice water after blanching.

• Use cold water with a temperature not exceeding 15°C.
• Soak the leeks in cold water for 1 or 2 minutes until they are completely cooled.

Allow the leeks to drain completely and air-dry. Remove the leeks from the cold water and place them in a colander to drain. Once drained, spread the leeks on a plate or baking tray to air dry for a few minutes.

• You can also use a clean paper towel to absorb any remaining water from the leeks.
• Freezing leeks while they are still wet can compromise their quality and storage time.

Place a sheet of wax paper or parchment paper on the baking tray and arrange the leeks in a single layer. Don't worry if the leek pieces touch each other, but avoid stacking them, as that will cause them to stick together and extend the freezing time.

Freeze the leeks for 30 minutes or until they are fully frozen. Place the tray with leeks into the freezer and wait for 20-30 minutes, then check if they are frozen. If not, allow more time.

• Gently press the leeks to see if they are firm and crisp. If they are still soft and elastic, leave them in the freezer a bit longer.

Transfer the frozen leeks into a freezer-safe container. Once the leeks are frozen, place them into a freezer-safe box or resealable bag. Be sure to close the container tightly. If using a resealable bag, squeeze out all the air before sealing it.

Leeks can be stored in the freezer for 10-12 months. If you store them in an airtight container and maintain a steady freezer temperature of -18°C, leeks can be kept for a long period. Frozen leeks remain good even after a year of storage.

• Be sure to label and date the storage container so you can track how long they’ve been stored.
• Improper storage or excessive storage time will cause the leeks to become soft and spongy.
• If you don’t blanch the leeks before freezing, their quality and flavor will diminish after 1-2 months.

• To preserve the best flavor of the leeks, avoid thawing them before cooking.

• Fresh leeks
• Cutting board
• Sharp knife
• Large pot
• Blanching basket or cooking mesh bag
• Large bowl for washing and soaking the leeks
• Colander
• Baking tray
• Wax paper or parchment paper
• Freezer-safe container or resealable bag