"Leeks can be extremely dirty and are best cleaned after they've been trimmed and cut. Soak cut leeks in a bowl of cool water; lift them out, replace water, and repeat until no grit remains at the bottom of bowl...."
INGREDIENTS
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2 tablespoons olive oil, plus more for drizzling
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6 medium leeks, (about 2 1/4 pounds), whites and light green parts only, halved lengthwise and thinly sliced crosswise, cleaned
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1 teaspoon dried thyme
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Coarse salt and freshly ground pepper
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4 large slices (1/2 inch thick) hearty country bread
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8 ounces Brie cheese, thinly sliced
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2 plum tomatoes, thinly sliced crosswise