Step 1

Preheat a grill to high. Pat the pork dry and season with salt and pepper. Lightly oil the grill, then grill the pork, turning, until marked, about 10 minutes.

Step 2

Meanwhile, combine the peaches, wine, brown sugar, and 1/2 cup water in a saucepan. Remove strips of zest from the lemon with a vegetable peeler and add to the pan; squeeze in the lemon juice. Cover and cook over medium-high heat until the peaches are just tender, 5 to 7 minutes. Transfer to a bowl with a slotted spoon.

Step 3

Add the mustard, 1/2 teaspoon salt and 1/4 teaspoon pepper to the juices in the pan. Transfer 1/3 cup of the liquid to a small bowl and stir in the chopped rosemary; brush onto the pork and continue grilling until a thermometer inserted into the thickest part registers 145 degrees F, 10 to 15 more minutes. Transfer to a cutting board.

Step 4

Meanwhile, simmer the remaining liquid in the saucepan until syrupy, about 3 minutes. Remove from the heat and season with salt. Return the peaches to the pan along with the rosemary sprigs. Slice the pork and serve with the peaches.

Step 5

Per serving: Calories 376; Fat 8 g (Saturated 3 g); Cholesterol 147 mg; Sodium 181 mg; Carbohydrate 26 g; Fiber 1 g; Protein 49 g