
Leeks are one of those vegetables that transform completely under high heat — 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 do all the heavy lifting, with nothing more than good olive oil, a pinch of red pepper flakes, and a bright squeeze of fresh lemon to finish. Because the flavor comes entirely from the roasting process and pantry staples, there's no need for any sweetener to coax out complexity — it's already there. The two-stage roast, flipping the leeks halfway through, is the key move that builds that gorgeous golden crust on the cut side while keeping the inner layers tender and almost melting. A scatter of fresh flat-leaf parsley at the end adds a pop of color and a clean herbal note that ties everything together beautifully. It works as an elegant side dish alongside roasted chicken or fish, or honestly just on its own with some crusty bread to soak up the lemony olive oil pooling on the platter.
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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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