Lomo Saltado

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2 tablespoons vegetable oil, plus more if needed

1 pound beef sirloin or tenderloin, sliced into thin strips

1 red onion, diced

2 tomatoes, cut into wedges

1/4 cup soy sauce

2 tablespoons red or white wine vinegar

1 to 2 tablespoons chopped fresh cilantro, plus more for garnish

1 teaspoon ground cumin

3 cloves garlic, minced

1 aji amarillo pepper (or another fresh spicy pepper), stemmed, seeded and thinly sliced

Kosher salt and freshly ground black pepper

Cooked white rice, for serving

1 cup cooked French fries (you can use frozen fries)