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1
To prepare quick-pickled onions, combine apple cider vinegar, sugar, 1/2 teaspoon sea salt, allspice, peppercorns, and red pepper flakes in a small saucepan. Set over medium-high heat. When mixture starts to steam and sugar has dissolved, add sliced onions, pressing a bit to make sure all slices are immersed. Steep in the brine for 10 minutes. If working ahead, place onions and brine in a wide mouth jar, cool to room temperature, then seal and refrigerate. (If you don't have time to make ahead, they'll still be delicious.)
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2
Fill a sink with cold water and soak the corn, husks and all. (This step isn't absolutely necessary, but it helps to plump the kernels.)
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3
Prepare a hot grill.
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4
Shuck corn and set over hot coals. Cook each ear until nicely charred, rotating a quarter turn every 2 to 3 minutes. Set aside to cool, then slice kernels from the cob and sprinkle with sea salt.
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5
To prepare dressing, combine the lime, garlic, 1/4 teaspoon sea salt, and sherry vinegar in the pitcher of a blender. Pulse to break down limes, scrape the sides, then turn blender to low. Slowly drizzle in olive oil, stopping to scrape down sides as needed. Add a pinch or two of sea salt, as needed.
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6
Toss lettuce with several tablespoons dressing and arrange in a large serving bowl. Scatter over the quick-pickled onions and nectarine slices. Top off with corn kernels and a generous drizzle of lime dressing, and toss gently. Finish with several twists of black pepper and a pinch of sea salt. Serve immediately.
