Warm a grill pan over high heat. Lightly grease the pan with cooking spray or oil and add peaches, cut side down. Grill for 1-2 minutes or until you have golden brown grill marks. Transfer peaches to a cutting board and let cool while you prepare the rest of the salad.
Lay rocket on a large salad plate, add blueberries, and top with goat cheese.
To make the vinaigrette, combine vinegar, honey, mint, shallot, salt, pepper, and oil in a small mason jar. Tighten the lid and shake until well blended.
Once the peaches are cooled, add them to the salad. Drizzle with the honey vinaigrette and serve immediately.