Steps
Preheat oven to 200°C (390°F).
In a small bowl, mix olive oil, garlic, rosemary, thyme, salt, and pepper.
Rub the herb mixture all over the lamb loin.
Toss the potatoes, carrots, and zucchini with balsamic vinegar, salt, and pepper.
Spread vegetables on a baking tray and place the lamb loin on top.
Roast for 18-20 minutes for medium doneness, turning vegetables halfway.
Rest the lamb for 5 minutes, then slice and serve with roasted vegetables.