12 ounces butternut squash - peeled, seeded, and cut into 1-inch pieces
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1 small yellow onion, cut into 1/2-inch pieces
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3 tablespoons balsamic vinegar, divided
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1 tablespoon brown sugar
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2 teaspoons vegetable oil
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kosher salt and ground black pepper to taste
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6 ounces kale, roughly chopped
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0.25 cup vegetable broth
Instructions
Preheat the oven to 400 degrees F (200 degrees C).
Place squash into a large bowl. Add onion, 1 1/2 tablespoons vinegar, brown sugar, oil, salt, and pepper; toss to coat. Spread mixture in a single layer onto a baking sheet.
Bake in the preheated oven until squash is tender and golden, 30 to 40 minutes. Set aside.
Combine kale and broth in a heavy-bottom skillet over medium heat; bring to a light simmer. Cover the skillet, reduce heat, and cook until kale is tender but still bright green, about 5 minutes; drain any excess liquid.
Mix together kale, squash mixture, and remaining 1 1/2 tablespoons vinegar in a serving bowl.