Caramelized Onion and Kale Slaw

Name: Caramelized Onion and Kale Slaw
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Yield: 4 servings
Ingredients: 1 large onion, thinly sliced; 2 tablespoons olive oil; 1 bunch kale, stems removed and leaves chopped; 2 tablespoons apple cider vinegar; 1 tablespoon honey or maple syrup; Salt and pepper to taste

Highlighted under: Healthy & Light

I absolutely love how the savory sweetness of caramelized onions elevates the earthy richness of kale in this slaw. We developed this recipe to create a side dish that’s not only refreshing but also full of flavor. The caramelization process brings out the natural sugars in the onions, making this slaw a standout at any meal. It’s quick to prepare and makes a great addition to barbecues, potlucks, or even as a topping on sandwiches. Trust me, once you try it, you'll want to make it again and again!

Created by

Emily

Last updated on 2026-01-08T12:10:31.564Z

When I first made this Caramelized Onion and Kale Slaw, I was blown away by how simple ingredients could create such a bold flavor profile. The key is really in the caramelization; cooking the onions low and slow allows them to develop a deep sweetness that pairs beautifully with the robust kale leaves. I recommend using fresh kale from the market for the best texture and taste.

This slaw not only serves as a delightful side but can also shine as a main dish when paired with grilled chicken or tofu. I’ve even tossed it into a wrap, and it was fantastic! Give it a try, and I promise it will become a go-to recipe in your kitchen.

        Why You Will Love This Recipe
        The perfect balance of sweet and savory flavors
Nutritious and satisfying, making it a guilt-free dish
Versatile enough to accompany any meal

      

Understanding Caramelization

The process of caramelizing onions is central to this slaw, as it transforms their sharp bite into a deep, sweet flavor. This occurs through a slow cooking method over medium heat, allowing the natural sugars to develop. Keep an eye on the onions to avoid burning; you want them to turn golden brown with a glossy texture, not charred. Stir frequently during the cooking to ensure even caramelization, and don't be afraid to lower the heat if they begin to cook too quickly.

Using a good quality olive oil for this step not only enhances flavor but also helps achieve a beautiful caramelization. If you're looking for deeper flavor notes, consider adding a splash of balsamic vinegar during the last few minutes of cooking. This can add a hint of acidity that contrasts nicely with the sweetness, amplifying the overall depth of flavor in the slaw.

Selecting and Preparing Kale

Kale is a hearty green that pairs perfectly with the sweetness of caramelized onions, but not all kale varieties are created equal. Lacinato kale, also known as dinosaur kale, is my personal favorite for this recipe due to its tender leaves and less bitter flavor. When preparing the kale, ensure you remove the tough stems; this can be done easily by holding the stem with one hand and stripping the leaves away with the other.

Chopping the kale into bite-sized pieces is crucial for optimal texture. After chopping, consider massaging the leaves with a little olive oil or salt for a minute; this breaks down the fibers, making the kale softer and more palatable. Be sure to let it rest after adding the apple cider vinegar and sweetener, as this also allows the flavors to infuse and enhances the overall enjoyment of the dish.

Serving and Storing Tips

To make this slaw even more exciting, don't hesitate to experiment with additional ingredients. Consider adding sliced apples or pears for an extra layer of sweetness or some toasted nuts for crunch. This slaw also works wonderfully as a topping for grilled meats or as a fresh bed for a protein of your choice, mixing vibrant flavors and textures that are sure to impress.

For make-ahead preparation, combine the kale and dressing without the onions up to a day in advance, storing them separately. When ready to serve, simply mix in the caramelized onions. This dish can be stored in an airtight container in the refrigerator for up to three days, although the texture is best enjoyed fresh. If the slaw begins to lose its crunch, a quick toss with a little extra vinegar can revive its bright flavors.

Ingredients for Caramelized Onion and Kale Slaw

Slaw Ingredients

1 large onion, thinly sliced
2 tablespoons olive oil
1 bunch kale, stems removed and leaves chopped
2 tablespoons apple cider vinegar
1 tablespoon honey or maple syrup
Salt and pepper to taste

Instructions

Caramelize the Onions

In a large skillet, heat the olive oil over medium heat. Add the sliced onions and a pinch of salt. Cook, stirring frequently, until the onions are golden brown and caramelized, about 15 minutes.

Prepare the Kale

While the onions are cooking, wash and chop the kale into bite-sized pieces. In a large bowl, combine the kale, apple cider vinegar, honey or maple syrup, and season with salt and pepper.

Combine and Toss

Once the onions are fully caramelized, remove them from the heat and let them cool slightly. Add the warm onions to the kale mixture and toss everything together until well combined.

Serve

Let the slaw sit for 5-10 minutes to allow the flavors to meld before serving. Enjoy this slaw as a side dish or a topping for your favorite sandwiches!

Pro Tips

For an extra crunch, you can add chopped nuts or seeds to the slaw right before serving. Adjust the sweetness by varying the amount of honey or maple syrup based on your preference.

Ingredient Substitutions

If you're looking to adjust this recipe for dietary preferences, there are several simple substitutions you can make without sacrificing flavor. For a vegan option, swap the honey for maple syrup or agave nectar, both of which will integrate seamlessly into the slaw while keeping it naturally sweet. Additionally, if kale isn't your thing, feel free to substitute with shredded cabbage or a mix of other greens like arugula for a peppery kick.

Another substitution to consider is using different types of vinegar. While apple cider vinegar adds a lovely fruity note, rice vinegar or even a mild white wine vinegar can work well if that’s what you have on hand. Remember that the acidity from the vinegar balances the sweetness of the onions, so choose a vinegar with a flavor profile you enjoy.

Troubleshooting Common Issues

One common issue when caramelizing onions is the risk of burning. To mitigate this, ensure your skillet is not too hot and keep stirring frequently. If you find the onions are browning too quickly, lower the heat and add a splash of water to help them cook without burning. This approach also helps deglaze any flavorful bits sticking to the pan, which can enhance the slaw's overall taste.

If you find the slaw too salty or tangy after mixing everything together, don't worry! A pinch of sugar can help balance the flavors. Conversely, if it feels flat, a bit more vinegar or a squeeze of fresh lemon juice can brighten it up nicely. Adjusting these components right before serving can elevate the dish remarkably and ensure a delightful flavor profile.

Questions About Recipes

→ Can I make this slaw ahead of time?

Yes, you can prepare the slaw a day in advance. Just keep it in the fridge, and give it a good toss before serving.

→ Is there a substitute for kale?

You can use other greens like spinach or cabbage if you prefer a different flavor or texture.

→ Can I add other ingredients to the slaw?

Absolutely! Add-ins like shredded carrots, apples, or nuts can enhance the flavor and texture.

→ How long will leftovers last?

Leftover slaw will keep in the fridge for about 2-3 days. Just be aware that the kale may lose some of its crunch.