Sweet and Sour Onions: A Flavorful and Easy Side Dish

Sweet and Sour Borettane Onions are a delicious and simple side dish that pairs perfectly with roasted meats, grilled fish, or even as a topping for crostini. These tender, caramelized onions are cooked in a rich blend of brown sugar, apple cider vinegar, and butter, creating a perfect balance of sweetness and acidity. Whether you're looking for an elegant holiday side or a quick weeknight addition, this recipe is sure to impress!

Why Everyone Will Love This Recipe

• Bursting with Flavor – The combination of sweet caramelized sugar and tangy vinegar makes these onions irresistibly tasty.
• Easy to Make – With just a few ingredients and minimal effort, you can prepare this dish in under an hour.
• Versatile – Perfect as a side dish, topping, or even a gourmet addition to sandwiches and salads.
• Make-Ahead Friendly – These onions store well, making them great for meal prep or entertaining.

What Are Borettane Onions?

Borettane onions are small, flat Italian onions known for their mild and slightly sweet flavor. Traditionally used in Italian cuisine, they caramelize beautifully when cooked, enhancing their natural sweetness. Their unique shape and texture make them a popular choice for pickling, roasting, and glazing in sweet and sour sauces.

Cooking Tips

• Choose the Right Onions – Borettane onions work best for this recipe, but pearl onions can be a great substitute.
• Adjust the Sweetness – If you prefer a tangier dish, reduce the sugar slightly and increase the vinegar.
• Use Quality Butter – High-quality butter enhances the richness of the dish, making the onions even more indulgent.
• Don’t Rush the Cooking Process – Cooking on low heat allows the onions to absorb the flavors fully and become tender.

Frequently Asked Questions

Can I Use White Sugar Instead of Brown Sugar?

Yes, but brown sugar adds a deeper caramelized flavor. If using white sugar, consider adding a teaspoon of honey or molasses.

What Type of Vinegar Works Best?

Apple cider vinegar gives a balanced tang, but you can also use balsamic vinegar for a richer, slightly sweeter flavor.

How Do I Make This Dish Vegan?

Simply swap out the butter for a plant-based alternative like vegan butter or olive oil.

Can I Make This Dish Ahead of Time?

Absolutely! These onions taste even better the next day as the flavors continue to develop.

What Dishes Pair Well With Sweet and Sour Onions?

They complement roasted meats, grilled fish, cheese platters, and even bruschetta or crostini.

How to Store

Store leftover sweet and sour onions in an airtight container in the refrigerator for up to 5 days. Reheat gently on the stovetop or in the microwave before serving.

How to Freeze

To freeze, place the cooled onions in a freezer-safe container and store for up to 3 months. Thaw in the refrigerator overnight and reheat before serving.

How To Make Sweet And Sour Onions

In a pan over medium heat, combine brown sugar and water, stirring until the sugar dissolves.

Add 55g of butter and let it melt completely into the sugar mixture.

Add the Borettane onions, seasoning with salt, pepper, and thyme. Pour in the apple cider vinegar and mix well.

Cover the pan with a lid and cook on low heat for 30 minutes, stirring occasionally.

After 30 minutes, add the remaining 30g of butter, mixing well to create a rich, glossy sauce.

Transfer the onions to a serving dish, drizzle with the sweet and sour sauce, and garnish with fresh thyme.