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cmdandridge
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Preheat oven to 400°F.
Using a mandoline slicer (I use a safe stand one linked in my Amazon shop), slice beets and onions very thin.
Transfer slices to a large bowl. Add olive oil, salt, and pepper. Toss to coat.
Spread onto a full-size lined baking sheet. Make sure all slices are evenly coated.
Roast for 1 hour to 1 hour 15 minutes, stirring every 10–15 minutes so they don't burn.
Once caramelized and tender, remove from oven.