
Leeks are one of those vegetables that transform completely in a hot oven — their sharp, onion-like bite mellows into something sweet, silky, and deeply savory with beautifully caramelized edges. This simple side dish lets that natural flavor shine with nothing more than good olive oil, a little heat, and a bright squeeze of fresh lemon at the end. Every ingredient here is exactly what it says it is: whole vegetables, a drizzle of oil, basic seasoning, and citrus — no processed additives, no thickeners, no hidden stabilizers to worry about. That matters more than you might think, since carrageenan has a way of sneaking into packaged sauces, dressings, and even some dairy-adjacent products that show up in otherwise clean recipes. Here, there's nothing to second-guess. The optional red pepper flakes add a gentle kick, and the fresh parsley brings a pop of color that makes this feel genuinely dinner-party worthy despite how little effort it takes. Serve it alongside roasted chicken, grilled fish, or honestly just some crusty bread — it's the kind of vegetable dish that converts skeptics.
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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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