A fast, flavorful beef stir fry coated in a glossy sweet-savory sauce with onions and peppers.

Servings: 4
Prep Time: 15 minutes
Cook Time: 10 minutes
Total Time: 25 minutes
Dietary Notes: High-Protein, Dairy-Free

Ingredients (Checklist with Measurements)

For the Beef:

• 1 pound (450 g) flank steak or sirloin, thinly sliced
• 1 tablespoon cornstarch
• 1 tablespoon soy sauce
• 1 tablespoon vegetable oil (for searing)

Vegetables:

• 1 large onion, sliced into wedges
• 1 red bell pepper, sliced
• 1 green bell pepper, sliced
• 2 garlic cloves, minced
• 1 teaspoon grated fresh ginger

Sticky Stir-Fry Sauce:

• 3 tablespoons soy sauce
• 2 tablespoons oyster sauce
• 2 tablespoons brown sugar
• 1 tablespoon rice vinegar
• 1 tablespoon sesame oil
• 1/4 cup (60 ml) water
• 1 teaspoon cornstarch (for slurry)

Optional:

• 1 tablespoon toasted sesame seeds
• 2 green onions, sliced

Instructions (Quick Recipe Card)

1. Toss beef with 1 tablespoon soy sauce and 1 tablespoon cornstarch.
2. Mix all sauce ingredients except slurry cornstarch.
3. Heat oil in a wok; sear beef until browned. Remove.
4. Stir fry onions, peppers, garlic, and ginger 2–3 minutes.
5. Return beef to the wok.
6. Add sauce and cornstarch slurry; cook until thick and glossy.
7. Top with sesame seeds and green onions.
8. Serve hot.

Notes

Slice beef very thin for fast cooking.
For best flavor, use a very hot wok or pan.

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Introduction

This Korean-inspired sticky beef stir fry is bold, glossy, and bursting with sweet-savory flavor. It’s the kind of weeknight dinner that tastes restaurant-quality but comes together faster than ordering takeout. I created this on a busy evening when I needed something satisfying in under 30 minutes—and it quickly became a go-to.

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Step-by-Step Cooking Guide

1. Prep the Beef

Slice the beef thinly across the grain for tenderness. Toss with soy sauce and cornstarch.
Tip: Partially freeze the beef for 20 minutes to make slicing easier.

2. Make the Sauce

Whisk soy sauce, oyster sauce, brown sugar, rice vinegar, sesame oil, and water in a bowl.
Tip: Adjust sugar to taste if you want it less sweet.

3. Sear the Beef

Heat a wok over high heat. Add oil. Sear beef in a single layer for 1–2 minutes per side until browned. Remove and set aside.
Tip: Do not overcrowd the pan or the beef will steam instead of sear.

4. Stir Fry the Vegetables

Add onions and peppers to the hot wok. Cook 2–3 minutes. Add garlic and ginger and cook 30 seconds.
Tip: Keep heat high for charred edges and better flavor.

5. Combine Everything

Return beef to the wok, pour in the sauce, and stir well.

6. Thicken the Sauce

Mix 1 teaspoon cornstarch with a splash of water. Stir it into the wok and cook until the sauce becomes thick and sticky.
Tip: Add more water if you prefer a looser sauce.

7. Finish and Serve

Remove from heat and garnish with sesame seeds and green onions.

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Ingredient Details & Substitutions

Ingredient Explanations

• Flank steak: Thin slices cook quickly and stay tender.
• Onion and peppers: Add sweetness and balance.
• Brown sugar: Helps produce the glossy glaze.
• Sesame oil: Adds classic Korean-style aroma.

Quality & Selection Tips

• Choose beef with visible marbling for tenderness.
• Use fresh ginger for the best punchy flavor.
• Bell peppers should be firm and brightly colored.

Substitutions

• Beef → chicken thigh strips or tofu
• Oyster sauce → hoisin sauce or extra soy plus 1 teaspoon sugar
• Rice vinegar → apple cider vinegar
• Cornstarch → potato starch
• Sesame oil → peanut oil (different flavor but still good)

Equipment Alternatives

No wok?
Use a large stainless steel or cast iron pan for high heat.
No cornstarch?
Use arrowroot starch but reduce quantity by 25%.

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Variations & Serving Suggestions

Flavor Variations

• Add 1–2 sliced green chilies for heat
• Add 1 tablespoon gochujang for deeper Korean flavor
• Add mushrooms for umami richness
• Add pineapple chunks for a sweet contrast

Dietary Variations

• Low-Sodium: Use low-sodium soy sauce
• Gluten-Free: Use tamari instead of soy sauce
• Low-Sugar: Reduce brown sugar to 1 tablespoon

Serving Ideas

• Serve over steamed rice, jasmine rice, or noodles
• Pair with kimchi or pickled cucumbers
• Serve in lettuce cups for a lighter option

Pairings

• Best with green tea, sparkling water, or a mild lager beer.

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Storage & Make-Ahead

Storage

Refrigerate leftovers up to 3 days in an airtight container.

Reheating

Stovetop: Heat in a pan with 1 tablespoon water to loosen the sauce.
Microwave: Heat in 30–40 second intervals, stirring.

Make-Ahead Tips

• Slice vegetables up to 24 hours ahead.
• Mix sauce ahead and keep refrigerated.
• Do not mix sauce with cornstarch slurry until cooking time.

Shelf Life Notes

Vegetables may soften after day two, but flavor remains excellent.

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Nutrition (Per Serving – Approximate)

Calories: 360
Protein: 33 g
Carbs: 16 g
Fat: 18 g
Sodium: Moderate
Allergens: Soy

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FAQ

Q: Can I use frozen beef?
A: Yes, but thaw fully and pat dry before cooking.

Q: My beef turned tough—what happened?
A: It may have overcooked or been cut too thick. Slice thinly and cook quickly over high heat.

Q: Can I double the sauce?
A: Yes; simply double all sauce ingredients and adjust thickness with extra slurry.

Q: Can I add noodles directly to the wok?
A: Yes, cooked noodles can be tossed in at the end for a stir fry noodle bowl.

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Optional Personal Story

I first developed this recipe after trying a similar dish at a small Korean eatery. That glossy black-brown sauce stuck with me, and after several rounds of testing, I found the perfect balance of sweetness, umami, and aroma. It’s now one of my most cooked weeknight meals.

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Call to Action

Try this Korean-Style Sticky Beef Stir Fry and let me know how it turns out. Share your version, leave a comment, or ask any questions—you might inspire the next variation.