To make the balsamic reduction, pour the 1/2 cup of balsamic vinegar in a pot and bring to a boil. Reduce to a simmer. Stir occasionally for about 12-15 minutes. You'll know it's done when it coats the back of a metal spoon. It will continue to thicken as it cools.
While the balsamic vinegar is on the stovetop, slice the peaches. Brush with a small amount of melted butter. Sprinkle a little bit of sugar on each one.
Place peaches on the grill. Try not to move them and let them sit for about 3 minutes. Flip and repeat. Set aside while you assemble the salad.
Layer lettuce, prosciutto, burrata, and peaches.
Spray with olive oil (I prefer a sprayer so as to not drown the lettuce).
Once the reduction had thickened, drizzle over the top of your salad and add fresh ground pepper.
For more protein, grill chicken to add to the salad.