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How to pickle onions and shallots in a delicious, crispy, sweet and sour sauce that isn’t bitter and doesn’t develop mold.

How to pickle onions: perfect balance of sweet and sour, and a crispy texture is the secret to making meals more appealing. This article provides detailed instructions on how to pickle onions in the Northern style without the bitterness, and how to pickle onions deliciously without mold, making it easy for you to make sweet and sour pickled onions at home. The simple recipe is suitable for both everyday meals and Tet (Lunar New Year) celebrations, creating a flavorful and appealing dish for the whole family.

Ingredients to prepare

To doHow to pickle onionsFor a crisp, white, and harmoniously sweet and sour dish without any bitterness, you will need to prepare the following basic ingredients:

  • Red onions:1 kg
  • Chilli: 5 fruits(Adjust to taste)
  • Carrot: 1/2 bulb(Adds color and a slight sweetness)
  • Rice water: 500ml(Helps reduce the pungency of onions, making them whiter and crispier)
  • Vinegar:500 ml
  • Road: 300 g
  • Salt: 50g

Buy ingredients for making sweet and sour pickled onions at Kamereo:

Notes on choosing ingredients for making pickled onions

  • Select The shallots are medium-sized and uniform in size.. Hold firmly in your hand.
  • Priority is given to actions taken.The skin is dry, the tuber is round, plump, and brightly colored..
  • Avoid actionsoft, deflated, watery, or moldyBecause it makes pickles spoil quickly.
  • Where should I buy onions?reliable, familiar sources to ensure quality.
  • Ly Son shallots onions are an ideal choice for pickling due to their crispness and spicy aroma; however, if fresh red onions are unavailable, regular red onions can still be used.

Ingredients for making delicious, crispy, sweet and sour pickled onions
Ingredients for making delicious, crispy, sweet and sour pickled onions

Recipe for delicious pickled onions

Below is a detailed guide to help you pickle onions that are crispy, sweet and sour, not pungent, and free from mold, following a traditional recipe and applicable to making sweet and sour pickled onions.

Prepare the onions and other ingredients.

Soak the shallots in rice water for about 2 hours to reduce their pungent taste and make them whiter. Then cut off the roots, peel off the outer skin, and rinse them with clean water 2-3 times. Arrange the shallots on a tray, let them drain, and sun-dry them gently for about 1 hour until they become slightly wilted.

Peel and wash the carrots, then carve them into flower shapes or thin slices to add color to the pickled onions. Wash the chili peppers and let them dry.

Fresh onions are cleaned, trimmed, and ready for pickling.
Fresh onions are cleaned, trimmed, and ready for pickling.

Prepare the soaking solution.

Combine 300g sugar, 50g salt, and 500ml vinegar in a large bowl and stir until completely dissolved. The pickling liquid should have a mild sweet and sour taste, not too strong, so that the onions can absorb the flavors easily and taste better. Set this mixture aside and let the pickling liquid cool down to about 35-40°C before using to avoid cooking the onions immediately.

A glass of clear, thick salt, sugar, and vinegar solution, ready for soaking the onions.
A glass of clear, thick salt, sugar, and vinegar solution, ready for soaking the onions.

Pickled cucumbers and onions

Arrange the red onions in a clean glass jar, alternating with carrots and chili peppers to make the pickled onions more visually appealing. Pour in the pickling liquid until the onions are completely submerged, using bamboo toothpicks or a heavy object to keep them submerged. Seal the jar tightly and store in a cool, airy place.

Jar of fresh onions soaked in a mixture of salt, sugar, and vinegar.
Jar of fresh onions soaked in a mixture of salt, sugar, and vinegar.

Finished product

After soaking for about 2-3 days, the pickled onions will start to become pleasantly sour and ready to eat. If the weather is cold or the onions are old, you can soak them for an extra day to allow them to absorb more flavor. The finished pickled onions have a beautiful color, a crispy texture, and a harmonious sweet and sour taste, making them perfect to eat with sticky rice cakes (bánh chưng and bánh tét) or meat dishes during Tet (Vietnamese New Year).

Crispy, sweet and sour pickled onions, ready to enjoy.
Crispy, sweet and sour pickled onions, ready to enjoy.

Tips and tricks for making delicious pickled onions.

To ensure your pickled onions are crispy, not pungent, and don’t develop a film during the pickling process, you can apply these helpful tips from the traditional method:

  • Adjust the amount of salt and sugar precisely to ensure the pickles ferment evenly, avoiding excessive saltiness or sweetness.
  • Using warm water to soak the pickles helps speed up the fermentation process.
  • Sterilize and thoroughly dry the glass jars before pickling to avoid white foam and mold.
  • Use a piece of plastic or a bamboo stick to press the cucumbers down, ensuring they are always submerged in brine.
  • When eating the melon, use clean utensils and avoid stirring too much to prevent the formation of white foam.
  • Store the jar of pickles in a cool, dry place for 5–8 days, or in the refrigerator for up to a month.
  • Avoid placing the jar in direct sunlight, as high temperatures reduce its quality and flavor.
  • Regularly check the pickling jar; if foam or mold appears, remove it immediately to protect the entire jar.
Tips for making delicious pickled onions

Frequently Asked Questions

How long does it take for pickled onions to be ready to eat?

Typically, pickled onions are ready to eat after being salted for about 3-5 days at room temperature. They are ready when they become translucent, have a mild aroma, and a slightly sour taste.

How to keep pickled onions crispy for longer?

Soak the onions in rice water and make sure they are thoroughly dried before pickling. Mix the pickling liquid in the correct ratio and ensure the onions are always submerged. Once the pickles reach the desired level of sourness, store them in the refrigerator to maintain their crispness.

What dishes go well with pickled onions?

Pickled onions are a great accompaniment to sticky rice cakes (bánh chưng and bánh tét), braised pork, jellied meat, or other high-protein, high-fat dishes, helping to balance the flavors and prevent satiety.

Why do pickled onions become soft and smelly?

The cause is often due to the onions being too wet, the pickling water being contaminated, or the onions not being completely submerged, creating conditions for bacteria to grow. Additionally, not sealing the jar tightly can also cause the pickles to spoil quickly.

Which type of vinegar should be used for pickling onions?

It’s best to use rice vinegar or white vinegar with a mild acidity and a light aroma so as not to overpower the natural flavor of the onions and to help the pickles ferment stably.

How long can pickled onions be stored?

Pickled onions stored at a cool, airy temperature can be used for about 5-8 days while still retaining their crispness and delicious flavor. If stored in the refrigerator, they can be used for 2-4 weeks.

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Kamereo stands out with its modern web and app technology platform, supporting quick ordering, managing multiple branches, order approval, and centralized cost tracking. Thanks to its on-time delivery system – orders placed until 12 AM are delivered before 6 AM – F&B kitchens always have ingredients ready to implement pickled onion recipes and serve menus as planned.

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Kamereo - Professional wholesale food application for F&B businesses
Kamereo – Professional wholesale food application for F&B businesses

Summary

How to pickle onions sweet and sour pickled onions aren’t overly complicated to make, but they require meticulous attention to detail in selecting ingredients, preparing them, and preserving them to ensure the onions remain crispy, fragrant, and free from bitterness or mold. When done correctly, pickled onions become an attractive side dish, enhancing the flavor of meals and festive dishes during Tet (Vietnamese New Year). To save time and ensure the quality of ingredients, you can refer to reputable spice and food products at Kamereo.vn order now and place your order quickly today.

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I am a Content SEO Writer specializing in the culinary and F&B marketing field, passionate about uncovering the stories behind food and dining brands. My experience comes from collaborating with chefs, restaurants, cafes, and real F&B projects. I focus on consumer insights, emerging food trends, and crafting content that connects dishes, brands, and customers.View Author posts

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