Recipe For Leftover London Broil: Sliced Thin for Sandwiches and Stir-Fries

London broil leftovers don’t have to mean dry, chewy meat. I’ve tested this method with home cooks of all skill levels, and slicing it thin is the game-changer for sandwiches or stir-fries.

This approach turns tough cuts into tender, flavorful strips that work in 10-minute meals. The key is cutting against the grain after resting, which shortens muscle fibers for maximum tenderness.

You’ll get restaurant-quality results without starting from scratch. These slices reheat beautifully and absorb marinades or sauces quickly, making them ideal for busy weeknights.

Use them in wraps, salads, or quick skillet dishes. No one will guess it’s leftovers.

Ingredients for Recipe for Leftover London Broil

Transform those leftovers into something even better. Just a few pantry staples needed.

The beef is the star here—slicing against the grain is non-negotiable (this shortens those tough muscle fibers). Use what you’ve got left, but aim for 1.5 lb to feed four. If your London broil is particularly lean, add an extra tbsp of olive oil when reheating. Most grocery stores carry decent soy sauce, but Kikkoman or La Choy are reliable for consistent flavor.

No red wine vinegar? Rice vinegar or lemon juice at the same amount works fine. Fresh ginger not on hand? Ground ginger at one-quarter the amount (trust me, it’s potent). The brown sugar can be swapped for honey or maple syrup if you’re avoiding refined sugar. For stir-fries, any bell pepper color works—green is crunchier, red is sweeter.

Sliced thin, this keeps 4-5 days in the fridge (perfect for meal prep). Freeze for up to 3 months if you’ve made a big batch. Reheat gently in a skillet with a splash of water to keep it juicy. Don’t overcrowd the pan—do it in batches if needed (worth the extra minute).

Step-by-Step Instructions for Leftover London Broil

Here’s my method for transforming chilled slices into something spectacular with minimal effort.

Step 1: Prepare the Marinade Base

In a bowl, whisk together the 0.25 cup Soy Sauce, 1 tbsp Red Wine Vinegar, 1 tbsp Brown Sugar, and 1 tsp Sesame Oil until the sugar dissolves completely. I always use low-sodium soy sauce here—it lets you control the saltiness without overpowering the other flavors.

The acid from the vinegar tenderizes the beef while the sugar caramelizes during cooking. You’ll notice the mixture takes on a glossy sheen when it’s properly combined. This forms the flavor foundation for both stir-fry and sandwich applications.

Step 2: Sauté Aromatics and Vegetables

Heat 2 tbsp Olive Oil in a large skillet over medium-high heat until it shimmers. Add the 3 cloves minced Garlic Cloves and 1 tbsp Fresh Ginger, stirring constantly for 30 seconds until fragrant but not browned. Ginger burns easily, so keep it moving.

Toss in the 1 whole Red Bell Pepper (thinly sliced) and 0.5 whole Red Onion (julienned). Sauté for 4-5 minutes until the vegetables soften slightly but retain a crisp bite. You’re looking for vibrant color and a slight char on the edges—this adds texture contrast to the tender beef.

Step 3: Cook the Beef and Finish the Sauce

Add the 1.5 lb Leftover London Broil (sliced thin against the grain) to the skillet. Stir-fry for 2-3 minutes until the meat is heated through and just beginning to brown at the edges. The thin slices cook quickly, so stay attentive.

Sprinkle the 1 tbsp Cornstarch over the mixture and stir well. This thickens the sauce slightly without creating lumps. Season with 0.5 tsp Salt and 0.5 tsp Black Pepper, then pour in the prepared marinade. Cook for another 1-2 minutes until the sauce coats the beef and vegetables evenly.

The sauce should reduce to a glossy consistency that clings to each slice. If it thickens too much, add a splash of water to loosen it. The cornstarch creates a velvety texture that makes every bite luxurious.

Step 4: Rest and Garnish

Remove from heat and let the mixture rest for 2 minutes. This allows the flavors to meld and the sauce to settle. The beef will absorb some of the liquid, becoming even more tender and flavorful.

Stir in the 0.25 cup Green Onions just before serving—their fresh, sharp bite cuts through the richness. For sandwiches, pile the mixture onto toasted bread while still warm. For stir-fry, serve over steamed rice to soak up every last bit of that incredible sauce.

Pro Cooking Tips for Great recipe for leftover london broil

Slicing Technique

Always slice your London broil against the grain into ¼-inch strips. This shortens the muscle fibers, making tough cuts tender. I use a 10-inch chef’s knife from my neighborhood butcher for precision. 💡

Reheating Method

Use medium-high heat in a cast-iron skillet with 1 tbsp olive oil. Add beef in a single layer to avoid steaming. Stir-fry for 2-3 minutes until edges brown slightly.

Sauce Thickening

For a glossy finish, mix 1 tbsp cornstarch with 2 tbsp cold water before adding to the skillet. Stir constantly until it reaches your desired consistency.

Flavor Boost

Add 1 tsp sesame oil at the end for depth. I tested this with home cooks, and it always elevates the dish. A little goes a long way—don’t overdo it.

Resting Time

Let the beef rest 2 minutes off heat before serving. This lets the juices redistribute. I learned this the hard way after too many dry meals early on.

Batch Cooking

Cook in batches if making a large amount. Overcrowding the pan lowers the temperature, resulting in soggy beef. Trust me, the extra minute is worth it. 🔥

Frequently Asked Questions