Grilled Lamb Loin Recipes: Easy Rosemary Medallions

These grilled lamb loin recipes make a special-tasting dinner without keeping you at the stove all evening. Lamb loin is already tender, so it needs little more than a hot grill, a rosemary-garlic rub, and a short rest. In about 32 minutes, you’ll have juicy lamb medallions with caramelized edges, fresh lemon, and fluffy couscous on the side.

Use temperature as your guide rather than relying on the clock alone. Remove the lamb at 63°C / 145°F, then let it rest before slicing. Those five minutes give the juices time to settle back into the meat.

Why You’ll Love This Recipe

• It turns a tender cut into a quick dinner that still feels special.
• Rosemary, garlic, and lemon season the lamb without covering up its flavor.
• The couscous steeps while the lamb rests, so both parts finish together.
• The method is easy to adjust for a smaller dinner or a larger cookout.

Recipe Information

Ingredients

For the grilled lamb loin

• 2 pounds (900 g) lamb loin, trimmed and cut into 8 equal medallions
• 2 tablespoons olive oil
• 3 garlic cloves, finely grated
• 1 tablespoon finely chopped fresh rosemary
• 1 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• 1 teaspoon ground cumin
• 1 lemon, divided

For the herbed couscous

• 1 1/2 cups dry couscous
• 1 1/2 cups hot chicken or vegetable stock
• 1 tablespoon olive oil
• 2 tablespoons chopped parsley
• 1/4 teaspoon kosher salt

Choose medallions that are close in thickness so they finish at the same time. If you’re buying a whole lamb loin, ask your butcher to trim it and cut it into thick portions. An instant-read thermometer will give you a more reliable result than an exact promise about grill time.

How to Make These Lamb Loin Recipes

1. Season the lamb

Pat the lamb dry with paper towels. In a shallow dish, mix the olive oil, garlic, rosemary, salt, pepper, cumin, and the finely grated zest from half the lemon. Add the medallions and turn them until they’re coated. Let them stand at room temperature for 15 minutes while the grill heats, but don’t leave raw lamb out for longer than two hours.

2. Heat the grill

Preheat a clean grill to medium-high, about 230–260°C / 450–500°F. Brush the grates lightly with oil just before cooking. A hot, clean grate helps the lamb release easily and gives it clear grill marks.

3. Grill the medallions

Set the lamb over direct heat and close the lid. Grill for 4 to 5 minutes on the first side, then turn and cook for another 4 to 5 minutes. Start checking the center with an instant-read thermometer; thicker medallions may need 1 to 2 extra minutes. If a piece is browning too quickly, move it to a cooler part of the grill.

Remove the lamb when the thickest medallion reaches 63°C / 145°F. For whole-cut lamb, this is the recipe’s target for a medium-rare to medium finish after resting. Check with the thermometer instead of cutting into the meat, which lets the juices escape.

4. Rest the lamb and make the couscous

Transfer the lamb to a plate and tent it loosely with foil for 5 minutes. While it rests, combine the couscous, hot stock, olive oil, and salt in a heatproof bowl. Cover for 5 minutes, then fluff with a fork and stir in the parsley. Add juice from the remaining lemon half to taste.

5. Slice and serve

Slice each medallion across the grain and spoon any resting juices over the top. Serve with the couscous, lemon wedges, and a few rosemary leaves.

Tips for Best Results

Let the lamb sit out only briefly to take the chill off and help it cook more evenly. Keep the grill hot, and resist pressing the meat with a spatula; that pushes flavorful fat and juices into the fire.

For the most accurate reading, insert the thermometer from the side into the center of a medallion. If you prefer lamb more done, keep cooking after it reaches 63°C / 145°F and check it often. Lean loin can dry out when it’s pushed too far. Resting the lamb for five minutes makes the slices noticeably juicier.

If the weather keeps you inside, use a very hot cast-iron grill pan. Sear the lamb for roughly the same amount of time, working in batches if necessary so the pan stays hot. Explore more lamb recipes for additional ways to use your grill or skillet.

Ingredient Substitutions

If you don’t have fresh rosemary, use 1 teaspoon dried rosemary, crushed between your fingers before you add it to the oil. Fresh thyme or oregano also works. Parsley can be swapped for mint in the couscous for a cooler, brighter flavor.

Pearl couscous, rice, or bulgur can replace regular couscous, but use the liquid and cooking-time directions on the package. For a lower-starch plate, serve the lamb with grilled zucchini, green beans, or a tomato-cucumber salad. Even if you use bottled lemon juice in a pinch, keep the zest if you can; it adds aroma without extra liquid.

What to Serve With

Pair these lamb loin recipes with crisp vegetables and something that can catch the juices. Grilled asparagus, roasted carrots, or a simple arugula salad with lemon all work well. For another quick centerpiece, browse easy weeknight dinners. A larger spread can include warm flatbread, chopped herbs, and yogurt-cucumber sauce.

A peppery salad balances the richness of the lamb, while roasted potatoes make the meal heartier. Keep sauces light so the rosemary and grill flavor stay in the foreground.

Storage Instructions

Cool leftover lamb and couscous within two hours, then store them separately in airtight containers in the refrigerator for up to 3 days. Slice the lamb before chilling only if you plan to use it in salads or wraps; whole medallions stay moister.

Freeze cooled lamb in a freezer-safe container for up to 2 months. Freeze the couscous separately for the best texture. Thaw both overnight in the refrigerator rather than on the counter.

Reheating Instructions

Reheat the lamb gently so the loin doesn’t become chewy. Place the medallions in a covered skillet with a splash of stock or water and warm them over low heat. You can also warm them, covered, in a 150°C / 300°F oven for about 10 minutes. Reheat leftovers to 74°C / 165°F before serving.

Microwave the couscous in short bursts with a teaspoon of water, fluffing it between bursts. Add a fresh squeeze of lemon after reheating to brighten the flavor.

Frequently Asked Questions

What is lamb loin?

Lamb loin is a tender, relatively lean cut from the back of the animal. It may be sold boneless, as thick medallions, or as bone-in loin chops. Boneless medallions are especially convenient for fast grilling.

Can I marinate the lamb longer?

Yes. The rosemary-garlic mixture can season the lamb for up to 8 hours in the refrigerator. Since lemon is acidic, add most of the lemon juice just before serving instead of marinating the lamb overnight in it.

How do I know the lamb is done without cutting it open?

Use an instant-read thermometer in the center of the thickest medallion. For this recipe, remove whole-cut lamb at 63°C / 145°F and rest it for 5 minutes. Temperature is more dependable than color, which can vary with the lighting and the cut.

Can I make this recipe ahead?

You can mix the seasoning and trim the lamb a day ahead, keeping both covered in the refrigerator. Make the couscous shortly before serving, and grill the lamb just before dinner for the best texture.

Nutrition Estimate

Per serving, including couscous, this recipe provides approximately 675 calories, 58g protein, 33g fat, 13g saturated fat, 31g carbohydrates, 3g fiber, 2g sugar, and 550mg sodium. These numbers are estimates based on the listed ingredients, so the exact result will vary with trimming, stock, and the lamb’s fat content.

Conclusion

With a hot grill and a thermometer, lamb loin recipes are a straightforward way to put an impressive dinner on the table. Rosemary, garlic, and lemon keep the preparation focused, and couscous adds a fast, satisfying side. For your next meal plan, see more grilled meat ideas and make these tender lamb medallions the centerpiece.