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Preheat oven to 400 degrees. Toss parsnips with 1 tablespoon olive oil in a large bowl and season with salt and pepper. Arrange parsnips in a single layer on a rimmed baking sheet and roast until tender and lightly caramelized, 20-25 minutes. Remove from oven and let cool slightly.
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Heat remaining 2 tablespoons olive oil in a large, heavy bottomed pot over medium heat. Add onion and carrots and cook until onions are soft and translucent, about 8 minutes.
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Add roasted parsnips and broth to pot, along with bay leaf and thyme. Bring to a boil, then lower heat to a simmer and cook for another 15-20 minutes.
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Remove from heat and discard bay leaf and thyme sprigs.
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Using an immersion blender (or transfer to a blender, in batches if necessary), blend until smooth. Season with salt and stir in 1 tablespoon apple cider vinegar. Taste and season again with more salt and remaining vinegar if necessary.
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To serve, ladle into bowls or mugs and garnish with a drizzle of Meyer lemon oil, a few beet chips and thyme leaves.