This burger takes the core flavors of lomo saltado — soy sauce, aji amarillo, red onion, tomato, and a hit of vinegar — and builds them into a beef patty with a quick stir-fry topping and crispy fries piled on top. It sounds like a lot of components, but most of them come together in under 10 minutes. The honest reason to make it: it’s genuinely different from anything else you’d throw on the grill, and it scales up cleanly for a group.
What makes this version work
Two things matter here. First, the aji amarillo paste goes directly into the patty mix, not just the mayo. That means the heat and fruitiness of the pepper cook into the beef rather than sitting on top of it — you get flavor all the way through, not just at the edges. Second, the stir-fry topping needs high heat and a short cook time. If you crowd the pan or let it go too long, the onions and tomatoes turn soft and watery and they’ll sog out the bun fast. Keep the heat at medium-high, work in a single layer, and pull the pan off heat the moment the liquid reduces slightly. That’s what keeps the topping bright and worth eating.
Make-ahead notes
The patties can be formed up to 24 hours ahead — stack them with parchment between each one, cover tightly, and refrigerate. They also freeze well for up to 2 months; thaw overnight in the fridge before cooking. The stir-fry topping is best made fresh, but if you’re cooking for a crowd, you can prep the sliced onions and diced tomatoes the night before and keep them in separate containers in the fridge. The aji amarillo mayo keeps refrigerated for up to 5 days in a sealed jar. Leftover cooked patties reheat reasonably well in a covered skillet over low heat with a splash of water — about 3 minutes per side — though they won’t be as juicy as fresh off the grill.
If something goes sideways
- Patties falling apart on the grill: The mix has no binder, so if your beef is too lean or overworked, the patties will crack. Stick with 80/20 ground beef and mix only until the ingredients are just combined — stop the moment you don’t see dry spots. Skip pressing the patties flat while they cook; that forces out the fat that holds everything together.
- Topping is watery and flooding the bun: Roma tomatoes are specified for a reason — they have less juice than beefsteak or vine tomatoes. If yours are very ripe, seed them before dicing. Also make sure the pan is fully hot before anything goes in; a lukewarm pan steams instead of sautés.
- Aji amarillo paste is hard to find locally: Most Latin grocery stores carry it jarred. Online it’s easy to source. In a pinch, a mix of one teaspoon of habanero hot sauce and half a teaspoon of turmeric gets you somewhere in the ballpark for color and heat, though the fruity note won’t be the same.
- Fries go soggy before serving: Cook the fries last, right before assembly. If you’re feeding a group, keep them in a single layer on a wire rack in a 250°F oven — not a plate, not a bowl — until you’re ready to build the burgers.
- Cheese not melting properly: Add the cheese slice in the last 60 seconds of cooking and cover the pan or grill with a lid. American melts faster and more evenly here; Swiss takes longer and needs that covered steam to fully melt.
Peruvian Lomo Saltado Beef Burger
Ingredients
For the Burger Patties
- 1 lb Ground beef (80/20 blend) For a juicier patty
- 1 tbsp Soy sauce Preferably low sodium
- 1 tbsp Aji amarillo paste Adds a signature Peruvian heat
- 1 tsp Ground cumin
- 0.5 tsp Smoked paprika
- 0.5 tsp Salt
- 0.25 tsp Black pepper
For the Stir-Fry Topping
- 1 tbsp Vegetable oil For sautéing
- 1 cup Red onion Sliced into thin strips
- 1 cup Tomatoes Diced, preferably Roma
- 1 tbsp Soy sauce
- 1 tbsp Red wine vinegar
- 1 tbsp Fresh cilantro Chopped
For Assembly
- 4 pieces Burger buns Preferably brioche
- 4 slices Cheese American or Swiss
- 0.5 cup French fries Crispy, for topping
- 0.5 cup Aji amarillo mayonnaise Optional, for added Peruvian flavor
Instructions
- In a mixing bowl, combine ground beef, soy sauce, aji amarillo paste, cumin, smoked paprika, salt, and black pepper. Mix until just combined, then form into four equal patties.
- In a heavy skillet over medium-high heat, add vegetable oil, followed by red onions and tomatoes. Sauté until onions are tender and tomatoes release their juices, about 5 minutes.
- Add soy sauce and red wine vinegar to the pan, toss to coat, and cook for another 2 minutes until slightly reduced. Remove from heat and stir in chopped cilantro.
- Heat a grill or pan over medium-high heat. Cook burger patties for about 4 minutes per side, or until desired doneness. In the last minute, add a slice of cheese to each patty to melt.
- Lightly toast the brioche buns, then spread aji amarillo mayonnaise on the bottom bun. Place the burger patty on top, followed by a generous scoop of stir-fry mixture and crispy French fries.
- Top with the bun and serve immediately with extra fries or a fresh side salad.
Notes
- For a spicier kick, add extra aji amarillo paste to the stir-fry or aji mayonnaise.
- You can also replace the beef with a plant-based alternative for a vegetarian option.
Nutrition
FAQ
What internal temperature should these patties reach?
Ground beef burgers need to hit 160°F (71°C) internal temperature. Use an instant-read thermometer — the 4-minutes-per-side guideline in the recipe is a starting point, but thickness and heat source vary, so the thermometer is the only reliable check.
Can I use a different chili paste if I can’t find aji amarillo?
You can, but the flavor will shift. Aji amarillo has a distinctive fruity heat that’s different from most substitutes. A small amount of habanero paste gets the heat level close, but you’ll lose some of the characteristic flavor that makes this burger distinct from a standard spiced patty.
How do I keep everything hot and ready at the same time when cooking for several people?
Cook the patties in batches and hold them on a wire rack in a 200°F oven while you finish the rest. Make the stir-fry topping in one large batch before you start grilling — it holds well covered off heat for 15 to 20 minutes and just needs a quick toss before serving.
Do I need brioche buns specifically?
No, but a sturdy bun matters here because the topping adds moisture. Brioche holds up better than a standard soft white bun, which can turn to mush quickly. A potato roll or a lightly toasted sesame bun also works well.
Can I make the aji amarillo mayo from scratch instead of buying it ready-made?
Yes — stir one tablespoon of aji amarillo paste into half a cup of plain mayonnaise and add a small squeeze of lime juice. Taste and adjust the paste to your heat preference. It takes about two minutes and the flavor is noticeably fresher than most jarred versions.
What to cook next
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