How Long to Cook London Broil on Pellet Grill

Welcome to the ultimate guide on cooking London Broil on a pellet grill! Cooking a London Broil to perfection requires knowing just the right amount of grilling time and temperature for your desired level of doneness. In this comprehensive post, we’re diving deep into how to grill the perfect London Broil, including preparation tips, grilling times, and some tricks to ensure your roast is the highlight of your dining table. Let’s fire up that pellet grill and get started!

What is London Broil?

Before we delve into the cooking process, let’s first understand what London Broil is. London Broil is not a cut of meat, as many believe, but rather a method of cooking. Traditionally, it refers to marinated beef flank steak, broiled or grilled, and then thinly sliced across the grain. Nowadays, top round steak is also often used for this dish. It’s beloved for its bold flavors and tender texture which can only be achieved by cooking it just right.

Preparing and Marinading Your London Broil

The key to a tender and flavorful London Broil lies in the marinade. You’ll need to marinate your meat for at least 4 hours, though overnight is best for deeper flavor penetration. Here’s a simple but effective marinade recipe to get you started:

  • 1/2 cup of soy sauce
  • 1/4 cup of olive oil
  • 3 cloves of minced garlic
  • 2 tablespoons of balsamic vinegar
  • 1 tablespoon of brown sugar or honey
  • 1 teaspoon of freshly ground black pepper
  • 2 tablespoons of chopped fresh herbs (such as rosemary and thyme)

Mix these ingredients well and place your London Broil in the marinade, ensuring it’s well-covered. Then, refrigerate until it’s time to grill.

Grilling Your London Broil to Perfection

With your pellet grill preheated to the right temperature and your marinated meat ready, it’s time to discuss the main event: grilling.

Step-by-step Grilling Guide:

  1. Remove your London Broil from the refrigerator and let it sit at room temperature for about 30 minutes.
  2. Preheat your pellet grill to 450°F (232°C), the ideal temperature for searing meat.
  3. Place the London Broil on the grill and cook for approximately 3-4 minutes per side to create a nice sear.
  4. After searing, reduce the grill temperature to around 375°F (190°C) and continue cooking.
  5. Use a meat thermometer to regularly check the internal temperature of the meat.

Cooking Times Based On Doneness:

DonenessInternal TemperatureCooking Time (After Searing)
Rare125°F (52°C)10-12 minutes
Medium Rare135°F (57°C)12-15 minutes
Medium145°F (63°C)15-18 minutes
Medium Well150°F (65°C)18-20 minutes
Well Done160°F (71°C)20-25 minutes

Keep in mind that these times are approximate. Factors such as the thickness of the meat and individual grill characteristics can affect cooking time. Always use a meat thermometer to achieve the exact level of doneness you prefer.

How Long to Cook London Broil on Pellet Grill

After Grilling: Resting and Slicing

Once your London Broil reaches the desired internal temperature, it’s crucial to let it rest before slicing. Rest the meat for at least 10 minutes. This allows the juices to redistribute throughout the meat, leading to a juicier and more flavorful dish. When it’s time to slice, cut against the grain in thin, even slices to ensure each bite is as tender as possible.

Serving Suggestions for London Broil

Your beautifully grilled London Broil can be served with a variety of sides. Here are a few suggestions to complement your meal:

  • Garlic mashed potatoes
  • Grilled asparagus
  • Crisp Caesar salad
  • Roasted vegetables
  • A bold red wine such as Cabernet Sauvignon or Merlot

Frequently Asked Questions Of How Long To Cook London Broil On Pellet Grill

How long should I cook London Broil on a pellet grill?

Cook London Broil on a pellet grill for approximately 20-25 minutes per pound, or until the internal temperature reaches 135-145°F for medium-rare to medium doneness.

Should I marinate London Broil before grilling?

Marinating London Broil enhances flavor and tenderness. Marinate for at least 2 hours or overnight for optimal results before grilling.

What temperature should the pellet grill be set to?

Preheat the pellet grill to 450°F for searing. Then, reduce the temperature to 250-275°F for slow roasting the London Broil to perfection.

Should I let London Broil rest after cooking?

Yes, let it rest for about 10 minutes after grilling. This allows the juices to redistribute, ensuring a juicier and more flavorful London Broil.

How do I know when London Broil is done cooking?

Use a meat thermometer to check the internal temperature. For medium-rare, it should register 135°F, and for medium, aim for 145°F.


Cooking London Broil on a pellet grill might seem intimidating, but by following this guide, you’ll be sure to impress your guests with a perfectly grilled meal. Remember to pay attention to marinating times, grill temperatures, and internal meat temperatures to achieve the ultimate flavor and tenderness that this dish promises. Happy grilling!

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