Broiling the plums for a few minutes intensifies their tangy-sweet flavor. While plums work best for this recipe, organic pluots, peaches and nectarines can be used in their place.
Preheat oven to 500° F. Heat a large ovenproof skillet over medium-high heat. Add 1 1/2 tablespoons olive oil to pan; swirl to coat. Sprinkle pork with 1/2 teaspoon salt and 1/4 teaspoon black pepper. Add pork to pan; cook 4 minutes, turning to brown on all sides.
Place pan in oven. Cook at 500° for 15 minutes or until a thermometer registers 145°. Remove pork from pan. Let stand 10 minutes; slice crosswise into 12 slices.
Preheat broiler to high. Without cleaning pan, arrange plums, cut sides up, in pan. Combine remaining 1 tablespoon oil, honey, and garlic, stirring well; brush plums evenly with honey mixture. Sprinkle with remaining 1/4 teaspoon salt and remaining 1/4 teaspoon pepper.
Broil plums 6 minutes or until lightly charred; sprinkle with chopped thyme. Serve with pork. Garnish with thyme sprigs, if desired.