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High-heat stir-frying over a screaming hot wok turns thin slices of beef sirloin into caramelized, tender bites in under three minutes. The combination of soy sauce and vinegar creates a glossy coating that clings to the meat and vegetables without turning the dish into soup.

The pan stays hot enough to sear instead of steam. You cook the beef in two batches so each piece makes contact with the metal.

This is what we make for weeknight dinners when plain stir-fry feels boring but elaborate cooking feels impossible.

Why This Recipe Works

The technique relies on velocity and temperature control. Rich mains need something to cut through, and a simple salad recipe does exactly that when served alongside this dish.

What makes this work:

• Slicing beef against the grain shortens the muscle fibers so each bite stays tender even when cooked over high heat
• Frying potatoes at 350°F creates a crispy exterior that holds up when tossed with the sauce at the end
• Cooking beef in two batches prevents the pan temperature from dropping, which would steam the meat instead of searing it
• Adding garlic in the last minute keeps it aromatic without burning, since raw garlic turns bitter at high temperatures
• Deglazing with soy sauce and vinegar creates a glossy coating that clings to the beef and vegetables without pooling at the bottom of the plate

What You'll Need

Shopping for this takes one trip to a standard grocery store. A good another great ajillo recipe uses similar pantry staples if you want to meal prep both dishes at once.

Ingredient Swaps

Most swaps work if you understand what they change. The ajillo works best when it hits the table at the same time as the main, especially if you're trying another great ajillo recipe for variety.

Common swaps:

• Yellow chili (ají amarillo) → fresh jalapeño or serrano with turmeric: Gives you heat but loses the fruity, floral notes that make this Peruvian - add ¼ teaspoon turmeric to mimic the color
• Beef sirloin → flank steak or ribeye: Flank steak is chewier but cheaper; ribeye is richer and more tender but costs more per pound
• Potatoes → sweet potatoes: Adds sweetness that changes the flavor profile - works if you like sweeter stir-fries but isn't traditional
• Soy sauce → tamari: Use this swap for gluten-free cooking - the flavor is nearly identical

Instructions

Timing matters more than technique here. For a version that comes together quickly, something creamy like potato wedges can be your side while the beef cooks.

1. Prep and fry the potatoes: Cut 3 large russet potatoes into thin strips (¼ inch thick), pat them completely dry with paper towels, then heat 2 inches of vegetable oil in a heavy skillet to 350°F (175°C). Fry the potatoes in batches for 5-7 minutes until golden and crispy, then drain on paper towels and season with salt immediately.

2. Slice and season the beef: Cut 1.5 lbs beef sirloin against the grain into thin strips (¼ inch thick), season with salt and pepper, then let it sit at room temperature for 5 minutes. Preheat your wok or large cast iron skillet over high heat for 5 minutes until smoking hot.

3. Sear the beef in batches: Add 1 tablespoon vegetable oil to the screaming hot pan, then cook half the beef strips in a single layer for 90 seconds without moving them. Flip and cook another 60 seconds until browned but still medium-rare inside (130-140°F/54-60°C), then transfer to a plate and repeat with remaining beef.

4. Stir-fry the vegetables: Add another 1 tablespoon oil to the same hot pan, toss in 1 large red onion (cut into thick wedges) and stir-fry for 2 minutes until slightly softened but still crisp. Add 3 roma tomatoes (cut into wedges), 1-2 sliced yellow chilies, and 3 minced garlic cloves, then stir-fry for 1 minute until fragrant.

5. Combine and glaze: Return the beef to the pan along with the fried potatoes, pour in 3 tablespoon soy sauce and 2 tablespoon white vinegar, then toss everything together for 30 seconds until the sauce coats the beef and vegetables. Remove from heat immediately, garnish with fresh cilantro, and serve over white rice.

What to Serve With It

The richness of seared beef needs balance on the plate. Rich mains need something to cut through, and simple salad recipe does exactly that when you time it right.

Three ways to serve it:

• Weeknight plate: Spoon lomo saltado over white rice with avocado slices on the side
• Entertaining spread: Serve family-style in a large platter with cilantro lime rice and plantain chips
• Meal prep version: Pack rice, beef, and vegetables in separate containers to reheat individually

Store and Reheat

Leftovers hold texture better than most stir-fries because the potatoes stay fairly crisp. For a version that comes together quickly, this creamy dip makes a good next-day lunch pairing if you have cooked rice on hand.

For best results when storing:

• Store components separately if possible - keep the fried potatoes in a separate container from the beef and sauce so they stay crispy longer
• Use shallow airtight containers to prevent the beef from sitting in accumulated moisture, which makes it tough when reheated
• Refrigerate within 2 hours of cooking to keep the beef safe - lomo saltado holds in the fridge for 3-4 days
• Reheat on the stovetop by adding 1 tablespoon oil to a hot pan, tossing the beef and vegetables for 2-3 minutes, then adding the potatoes in the last 30 seconds
• Skip freezing the fried potatoes - they turn mushy when thawed, though the beef and vegetables freeze fine for up to 1 month

Peruvian Lomo Saltado

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Peruvian Lomo Saltado features caramelized beef sirloin strips stir-fried with crispy fried potatoes and vegetables in a tangy soy-vinegar sauce. Cooking over very high heat ensures tender meat and crisp vegetables with a glossy coating. This flavorful dish comes together quickly, making it ideal for weeknight dinners.

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Prep Time 15 minutes mins

Cook Time 15 minutes mins

Total Time 30 minutes mins

Servings: 4 servings

Course: Main Dish

Cuisine: Peruvian

Ingredients Equipment Method Notes

Ingredients

  

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• 1.5 lbs beef sirloin cut against the grain into ¼ inch thick strips
• 3 large russet potatoes cut into ¼ inch thick strips and patted dry
• 1 large red onion cut into thick wedges
• 3 roma tomatoes cut into wedges
• 1-2 yellow chilies (ají amarillo) sliced
• 3 cloves garlic minced
• 3 tablespoon soy sauce regular soy sauce, not low-sodium
• 2 tablespoon white vinegar
• as needed vegetable oil for frying potatoes and stir-frying
• to taste salt
• to taste black pepper
• to taste fresh cilantro for garnish

Equipment

• Wok or large cast iron skillet Used for stir-frying beef and vegetables
• Heavy skillet Used for frying potatoes
• Paper towels To dry potatoes before frying

Method

 

1. Cut 3 large russet potatoes into ¼ inch thick strips. Pat them completely dry with paper towels. Heat 2 inches of vegetable oil in a heavy skillet to 350°F (175°C). Fry the potatoes in batches for 5-7 minutes until golden and crispy. Drain on paper towels and season immediately with salt.
   3 large russet potatoes, as needed vegetable oil, to taste salt
2. Cut 1.5 lbs beef sirloin against the grain into ¼ inch thick strips. Season with salt and black pepper. Let the beef sit at room temperature for 5 minutes. Preheat your wok or large cast iron skillet over high heat for 5 minutes until smoking hot.
   1.5 lbs beef sirloin, to taste salt, to taste black pepper
3. Add 1 tablespoon vegetable oil to the hot pan. Cook half the beef strips in a single layer for 90 seconds without moving them. Flip and cook another 60 seconds until browned but still medium-rare inside (130-140°F/54-60°C). Transfer to a plate and repeat with the remaining beef.
   1.5 lbs beef sirloin, as needed vegetable oil
4. Add another 1 tablespoon oil to the hot pan. Toss in 1 large red onion cut into thick wedges and stir-fry for 2 minutes until slightly softened but still crisp. Add 3 roma tomatoes cut into wedges, 1-2 sliced yellow chilies, and 3 minced garlic cloves. Stir-fry for 1 minute until fragrant.
   1 large red onion, 3 roma tomatoes, 1-2 yellow chilies (ají amarillo), 3 cloves garlic, as needed vegetable oil
5. Return the beef to the pan along with the fried potatoes. Pour in 3 tablespoons soy sauce and 2 tablespoons white vinegar. Toss everything together for 30 seconds until the sauce coats the beef and vegetables. Remove from heat immediately. Garnish with fresh cilantro and serve over white rice.
   1.5 lbs beef sirloin, 3 large russet potatoes, 3 tbsp soy sauce, 2 tbsp white vinegar, to taste fresh cilantro

Notes

• Pat potato strips completely dry before frying to prevent oil splatter and ensure crispiness.
• Cook beef in batches to avoid steaming and to maintain high pan temperature for caramelization.
• Add garlic at the last minute to avoid bitterness and retain aroma.

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