
Leeks don't always get the spotlight they deserve, but roasting them at high heat transforms these humble alliums into something genuinely special — caramelized at the edges, silky through the layers, and full of sweet, savory depth. A squeeze of fresh lemon and a final drizzle of good olive oil at the end brighten everything up and keep the flavors clean and vibrant. The optional hit of red pepper flakes adds just enough warmth to make each bite interesting without overwhelming the natural sweetness of the leeks. This is the kind of simple vegetable side that surprises people at the table, because it looks elegant but comes together with almost no effort. Every ingredient here is straightforward and naturally free from tree nut concerns — no label-checking required, just honest produce and pantry staples. Scattered parsley adds a pop of color and freshness if you want to dress it up for company, but it's equally satisfying served simply alongside roasted chicken or grilled fish.
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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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