Lomo saltado (Peruvian steak stir-fry)

Ingredients

• 700 g sirloin or tenderloin, in strips
• Salt, pepper and a touch of cumin
• French fries (soaked in ice water 30 minutes, double-fried)
• 1 onion, in thick slices
• Tomatoes, in wedges
• Green onion and cilantro
• For the sauce: 1/4 cup soy sauce
• 2 tbsp oyster sauce
• 1 tbsp vinegar
• 1/2 tbsp cornstarch
• 1 tbsp beef broth or water
• Cooked rice, to serve

Instructions

1. Season the beef with salt, pepper and cumin. Whisk the sauce ingredients together.
2. Fry the potatoes once until just cooked, rest 1 minute, then fry again until crisp.
3. Sear the beef in a screaming-hot pan 2 minutes per side and set aside.
4. Sauté the onion briefly, add the tomatoes for a few seconds, then return the beef.
5. Pour in the sauce, toss until glossy, and finish with green onion and cilantro.
6. Fold in the fries at the last moment and serve immediately over rice.