1 medium red onion, sliced and separated into rings
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½ cup olive oil
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3 tablespoons lemon juice
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3 cloves garlic, minced
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1 tablespoon dried rosemary, crushed
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1 teaspoon salt
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1 teaspoon ground black pepper
Instructions
Preheat the oven to 400 degrees F (200 degrees C).
Combine cauliflower, broccoli, asparagus, carrots, bell pepper, and onion in a large bowl.
Whisk olive oil, lemon juice, garlic, rosemary, salt, and pepper together in a small bowl until blended. Drizzle over vegetables and toss to coat. Transfer to 2 rimmed baking sheets.
Roast in the preheated oven, tossing occasionally, until tender, 20 to 25 minutes.