How to Make It
In a large bowl, stir the salt, sugar and boiling water until the sugar dissolves. Let cool until lukewarm. Add the chops and refrigerate for 4 hours.
Meanwhile, preheat the oven to 400°. Place the garlic on a sheet of foil and drizzle with 1 tablespoon of the oil. Wrap tightly and roast until very soft, 45 minutes. Cool. Squeeze the cloves from the skins and mash.
Light a grill and oil the grate. Remove the pork chops from the brine and pat dry. Rub all over with 2 tablespoons of the oil and season with salt and pepper. Grill over moderate heat, turning once, until lightly charred and just cooked through, 10 minutes. Transfer to plates; keep warm.
In a large skillet, heat 1 tablespoon of the oil. Add the grapes and cook over moderately high heat, stirring, until they start
to burst, 3 to 4 minutes. Add the remaining 1 tablespoon of oil and half of the mashed garlic and cook, stirring, until incorporated, 1 minute. Reserve the remaining garlic for another use. Transfer the grapes to the plates. Drizzle the chops and grapes with vinegar and serve.