
Leeks are one of those vegetables that transform completely in a hot oven — what starts out mild and a little grassy becomes sweet, silky, and deeply caramelized at the edges. This simple side dish leans on just a handful of pantry staples: good olive oil, salt, pepper, and a squeeze of fresh lemon that brightens everything up at the end. A pinch of red pepper flakes adds a subtle kick if you're into a little heat, but the dish is just as satisfying without it. The technique is straightforward — roast cut-side down first to build that golden crust, then flip to finish the layers through — and the result looks genuinely impressive on a platter. A scatter of fresh flat-leaf parsley adds color and a clean herbal note right before serving. Every ingredient here is naturally free from tree nuts, so there's no label-checking or substitution stress involved — just clean, honest produce and olive oil doing their thing. It pairs beautifully with roasted chicken, grilled fish, or honestly just a crusty piece of bread.
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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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