
Leeks don't always get the spotlight they deserve, but roasting them at high heat completely transforms their mild, oniony sweetness into something deeply caramelized and almost silky. The cut sides go golden and jammy in the oven, developing a richness that feels far more indulgent than the short ingredient list would suggest. A generous squeeze of fresh lemon at the end cuts right through that richness, brightening every bite, while a final drizzle of good olive oil ties it all together. Optional red pepper flakes add a gentle kick if you're in the mood for a little heat. This is the kind of side dish that works beautifully alongside roasted chicken, grilled fish, or a simple grain bowl — and it comes together with almost zero fuss. Since every ingredient here is naturally plant-based, there's no need to swap anything out or check labels for hidden dairy; the olive oil does all the work that butter might in another recipe. Scatter some fresh parsley over the top before serving and it looks genuinely impressive on the table.
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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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