Mix together the olive oil, allspice, 1 1/2 teaspoons salt and 1 teaspoon pepper in a small bowl to form a paste. Transfer the mixture to a large resealable plastic bag and add the pork chops, massaging the paste into the chops to coat. Marinate at room temperature for about 30 minutes.
Meanwhile, melt the butter in a large saucepan. Add the apples and leeks and season with salt and pepper. Add 1/2 cup water and bring to a boil. Reduce the heat to a simmer and cook, stirring occasionally, until the leeks are tender, about 15 minutes.
Heat a large nonstick skillet over medium-high heat. Remove 3 pork chops from the marinade and cook until lightly browned, about 1 1/2 minutes per side. Remove the pork chops to a plate and cook the remaining 3 chops.
Place each pork chop on a plate and spoon the apple-leek mixture (including any juices) on top.
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