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Dinner · Part 2 of 3: Instructions

Herb Roasted Lamb with Crispy Potatoes and Tomatoes Step-by-step instructions

A rustic roasting pan filled with herb-crusted lamb, golden roasted potatoes, and burst cherry tomatoes.
Prep
Cook
Total
Serves
4
Includes 10 min resting

Before you start

Before beginning, ensure that all ingredients are measured and ready. The potatoes should be scrubbed and cut into uniform pieces to ensure they finish cooking at the same time as the lamb. If using fresh herbs, wash them thoroughly and chop them finely.

Have your roasting pan and a reliable meat thermometer on hand. Preheating the oven is essential, so start this at least 20 minutes before you plan to put the lamb in the oven to ensure a consistent temperature throughout the cooking process.

Ingredients at a glance (4)
  • 2 lb lamb roast
  • 1 lb potatoes, cut into chunks
  • 1 pint cherry tomatoes
  • 2 tbsp fresh mixed herbs, chopped

Instructions

Preparation and Initial Roast

  1. Prepare the ingredients
    Preheat the oven to 400°F (200°C). Cut the potatoes into uniform chunks and ensure the lamb roast is patted dry with paper towels. Place the potatoes and lamb in the roasting pan, coating with the fresh herbs.
    Look for Potatoes and lamb are evenly coated with herbs.
    Tip Ensure the potatoes are cut to a similar size for even cooking.

At this stage, the lamb and potatoes should be arranged in the pan with a nice coating of herbs. The oven should be hot, and the kitchen should start to smell fragrant as the herbs release their essential oils. Check that the lamb is positioned in the center of the pan for even heat distribution. The potatoes should be in a single layer to ensure they begin to brown properly. This phase sets the foundation for the deep, complex flavors that will develop as the dish roasts.

Adding Tomatoes and Finishing

  1. Roast the lamb and potatoes
    Place the roasting pan in the preheated oven. Roast for 30 minutes, then add the cherry tomatoes to the pan. Continue roasting until the potatoes are tender and the lamb reaches an internal temperature of 145°F (63°C). Let the meat rest for at least 3 minutes.
    Look for Lamb is golden brown and tomatoes have begun to burst.
    Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
    Tip Watch the tomatoes closely so they do not collapse completely.

The kitchen will now be filled with the rich, savory aroma of roasting lamb. Check the potatoes; they should be turning a beautiful golden brown. The addition of the cherry tomatoes introduces a splash of color to the pan.

Watch for the tomatoes to begin to burst or wrinkle, which indicates they are releasing their juices and flavor. The lamb should be visibly browned on the outside, and the thermometer should show the internal temperature nearing the target. Ensure the vegetables are still moist and not burning.

Resting and Final Presentation

  1. Rest and serve
    Remove the pan from the oven and transfer the lamb to a cutting board. Let the meat rest for 10 minutes before slicing. Serve the lamb slices alongside the roasted potatoes and burst cherry tomatoes.
    Look for Meat juices redistribute during the rest.
    Tip Cover the lamb loosely with foil while resting to keep it warm.

The lamb is now resting, which is the final step before service. The juices should be pooling slightly around the meat on the cutting board. The potatoes should be perfectly tender on the inside with a crisp, golden exterior.

The tomatoes should be soft and slightly caramelized, providing a bright, sweet contrast to the savory lamb. Before carving, perform a final check to ensure the meat has rested for the full duration. The resulting slices should be juicy, tender, and ready to be plated with the roasted sides.

Common mistakes

A common mistake is overcrowding the roasting pan, which prevents the potatoes from becoming crispy and can lead to uneven cooking. Another error is failing to rest the meat, which results in a loss of juices when sliced. Do not add the tomatoes too early, as they will turn into mush; they only need enough time to burst and soften. Finally, avoid using a dull knife for slicing, as a sharp blade is necessary to get clean, thin slices that showcase the beautiful crust of the herb-crusted lamb.

How to tell it’s done

The lamb is done when it reaches an internal temperature of 145°F (63°C) for medium-rare, which is the ideal doneness for tenderness and flavor. Use a meat thermometer inserted into the thickest part of the roast to check. The meat should be slightly firm to the touch but still springy.

Once it reaches this temperature, it must be removed from the oven and allowed to rest on a carving board for at least 10 minutes. This resting period is non-negotiable, as it allows the internal juices to redistribute, ensuring every slice is perfectly moist.

  • Steaks, chops and roasts: 145°F (63°C) in the thickest part, then a 3-minute rest

Coming up in Part 3: common questions

  • Can this dish be made ahead of time?
  • Why is it important to let the lamb rest?
  • What should be done if the potatoes are not tender?

Also in Part 3: variations (Garlic and Lemon Lamb, Root Vegetable Medley), storage and make-ahead, and the printable recipe card.

Up next · Part 3 of 3

2 variations · storage & make-ahead · 3 answers · printable card

Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)