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Onion Steak Stir Fry

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Total Time: 30 Minutes
Active Prep Time: 15 Minutes
Cook Time: 15 Minutes
Intensity Level: Easy to Moderate (Fast-paced cooking, but simple techniques)
Servings: 4

Recipe Description

This Onion Steak Stir Fry is a weeknight hero—delivering restaurant-quality flavor in under 30 minutes. Thinly sliced steak is marinated in a savory-sweet sauce, then quickly seared with a mountain of sweet onions until caramelized and tender. The result is a hearty, satisfying dish that’s perfect over a bed of fluffy rice or noodles. It’s a perfect balance of protein-rich beef, sweet alliums, and a glossy, umami-packed sauce that coats every bite.

Ingredients

For the Steak & Marinade:

  • 1.5 lbs (680g) flank steak, skirt steak, or sirloin, thinly sliced against the grain

  • 3 tablespoons soy sauce (low sodium preferred)

  • 1 tablespoon oyster sauce

  • 1 tablespoon cornstarch

  • 2 teaspoons sesame oil

  • 1 teaspoon freshly grated ginger

  • 2 cloves garlic, minced

  • ½ teaspoon black pepper

For the Stir Fry:

  • 2 large yellow or sweet onions (about 1.5 lbs), sliced into ½-inch half-moons

  • 1 large bell pepper (any color), sliced (optional for color)

  • 3 tablespoons vegetable oil (divided)

  • ¼ cup water or beef broth

For the Sauce (mix in a bowl):

  • ⅓ cup soy sauce (low sodium preferred)

  • 3 tablespoons brown sugar or honey

  • 2 tablespoons rice vinegar or sherry vinegar

  • 1 tablespoon oyster sauce

  • 1 teaspoon cornstarch

  • 1 teaspoon sesame oil

For Serving:

  • Cooked white rice or noodles

  • Sliced green onions and sesame seeds for garnish

Instructions

Step 1: Marinate the Steak (5 mins)

In a medium bowl, combine the sliced steak with all the marinade ingredients: 3 tbsp soy sauce, 1 tbsp oyster sauce, 1 tbsp cornstarch, 2 tsp sesame oil, grated ginger, minced garlic, and black pepper. Toss thoroughly until every piece is well-coated. Set aside to marinate for at least 10-15 minutes while you prep the vegetables.

Step 2: Prep Vegetables & Sauce (10 mins)

Slice the onions and bell pepper (if using). In a separate small bowl, whisk together all the sauce ingredients—soy sauce, brown sugar, vinegar, oyster sauce, cornstarch, and sesame oil—until the sugar and cornstarch are fully dissolved. Set aside.

Step 3: Cook the Steak (5 mins)

Heat a large wok or heavy-bottomed skillet over high heat until very hot. Add 1½ tablespoons of vegetable oil and swirl to coat. Working in batches to avoid overcrowding, add half the marinated steak in a single layer. Let it sear undisturbed for 60-90 seconds until a deep brown crust forms. Flip and cook for another 30-60 seconds. Transfer to a clean plate. Repeat with the remaining steak, adding a touch more oil if needed. Do not cook the steak through entirely at this stage, as it will finish cooking later.

Step 4: Stir Fry the Vegetables (5 mins)

In the same wok over medium-high heat, add the remaining 1½ tablespoons of oil. Add the sliced onions (and bell peppers). Stir-fry for 4-6 minutes, allowing the onions to soften and develop golden, caramelized edges. You can add a splash of water or broth to help steam and soften them if the pan gets too dry.

Step 5: Combine & Simmer (5 mins)

Return the seared steak (and any accumulated juices) to the wok with the onions. Give the prepared sauce a final stir (the cornstarch may have settled) and pour it over the steak and onions. Increase heat to bring to a simmer, stirring constantly. The sauce will thicken into a glossy glaze within 1-2 minutes, coating the meat and vegetables beautifully. Remove from heat immediately once thickened.

Step 6: Serve

Serve the hot Onion Steak Stir Fry immediately over cooked rice or noodles. Garnish generously with sliced green onions and a sprinkle of sesame seeds.

Nutritional Information (Per Serving, without rice)

Note: Nutritional values are estimates and can vary based on specific ingredients and portion sizes.

  • Calories: ~380 kcal

  • Total Fat: 20g

    • Saturated Fat: 5g

  • Cholesterol: 85mg

  • Sodium: ~1600mg (Use low-sodium soy sauce to reduce)

  • Total Carbohydrates: 20g

    • Dietary Fiber: 2g

    • Sugars: 13g

  • Protein: 35g

  • Key Vitamins/Minerals: Excellent source of Iron, Zinc, Vitamin B12, and Vitamin C (if using bell pepper).

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