
Leeks are one of those vegetables that transform completely in the oven — what starts out mild and a little grassy becomes sweet, silky, and deeply caramelized at the edges. This simple roasted preparation lets that natural sweetness shine without any added sugars or processed sauces, which makes it a perfect fit for anyone cutting out high-fructose corn syrup and the sneaky processed ingredients that tend to tag along with it. A squeeze of fresh lemon at the end brightens everything up and keeps the flavors clean and vibrant. The optional hit of red pepper flakes adds just enough warmth to make this feel like more than a simple side dish. Everything here is whole, recognizable, and exactly what it looks like — olive oil, leeks, lemon, and a little seasoning. It comes together with minimal prep and a hot oven, making it an easy weeknight addition or an elegant starter for a dinner party spread.
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Preheat the oven to 425°F (220°C). Line a large baking sheet with parchment paper.
Trim the root ends and dark-green tops from the leeks, leaving only the white and light-green parts. Halve each leek lengthwise, then rinse under cold running water, fanning the layers to remove any grit. Pat thoroughly dry with paper towels.
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