The best herbs for a classic roast lamb are rosemary, garlic, and thyme, which complement lamb's rich flavor beautifully.
Lamb has a distinct and often earthy flavor that pairs exceptionally well with robust, aromatic herbs. For a classic roast lamb, the triumvirate of rosemary, garlic, and thyme is almost universally recommended due to their complementary characteristics. Rosemary, with its strong, piney, and slightly peppery notes, stands up well to lamb's richness. Garlic adds a pungent, savory depth that becomes sweet and mellow when roasted, enhancing the meat's natural flavors. Thyme offers a subtle, earthy, and slightly floral aroma that brightens the overall profile without overpowering. These herbs can be used in various ways: chopped and rubbed directly onto the lamb with salt and pepper, inserted into slits made in the lamb, or placed within the roasting pan to infuse the drippings. Bay leaves and oregano can also be excellent additions for a Mediterranean touch.
For maximum flavor infusion, combine finely chopped rosemary, minced garlic, and thyme with olive oil to create a paste, then rub it generously over the lamb, including under any fatty cap, a few hours or even a day before roasting.