Preheat oven to 425°F; line a large sheet pan with parchment.
Whisk vinegar, honey, 1 tablespoon oil, garlic, and rosemary in a small bowl.
Pat pork dry; season with salt and pepper. Toss potatoes with remaining 1 tablespoon oil, salt, and pepper; spread on pan and roast 15 minutes.
Remove pan; turn potatoes, place pork in center, and arrange beans around it.
Brush half the glaze over pork.
Roast 20-25 minutes, brushing pork with remaining glaze halfway, until pork reaches 145°F internally.
Remove; tent with foil and rest 5 minutes before slicing and serving.