Beef and String Beans Stir Fry Recipe: Wok-Seared Beef with Crunchy Green Bean Bites

This beef and string bean stir-fry delivers restaurant-quality wok searing in your home kitchen—tender beef strips with crisp-tender green beans that stay vibrant and crunchy. The secret lies in high-heat technique and precise timing, transforming simple ingredients into a dish that balances smoky, savory, and slightly sweet flavors. I've perfected this recipe over countless weeknight dinners, where it consistently earns rave reviews for its bold taste and satisfying texture.

The foundation starts with properly marinated beef—thinly sliced flank steak that develops a caramelized crust while remaining juicy inside. String beans are blanched just enough to soften slightly while maintaining their signature crunch, then tossed with the beef at the perfect moment.

A homemade sauce made with soy, ginger, and a touch of brown sugar ties everything together, creating a glossy coating that clings to each bite without overpowering the natural flavors.

What you'll achieve is a stir-fry that's equally impressive as a weeknight meal or dinner party dish—golden beef strips, bright green beans with crisp edges, and a sauce that's perfectly balanced between salty, sweet, and umami.

The aroma alone will have everyone gathering at the table, and each bite delivers that satisfying contrast of textures and flavors that makes stir-fry so universally loved.

Serve it over steamed jasmine rice for a complete meal, or pair with egg rolls for a more casual presentation. The leftovers reheat beautifully, making this an ideal recipe for meal prep. Here's how to create this wok-seared masterpiece at home.

Ingredients for beef and string bean stir fry

Restaurant-quality stir-fry begins with these carefully selected ingredients—thinly sliced beef, crisp-tender string beans, and aromatic sauce components.

The flank steak is non-negotiable for this dish—its lean yet tender texture becomes silky when sliced against the grain. Ask your butcher to slice it paper-thin if you're not comfortable with a sharp knife; otherwise, freeze it for 30 minutes before slicing for cleaner cuts. String beans should be bright green and crisp, not wilted—local farmers markets often have superior quality compared to grocery store produce. For the sauce base, low-sodium soy sauce is essential to control salt levels, while fresh ginger (not powdered) provides that signature aromatic depth. Penzeys or bulk spice sections are ideal for high-quality ginger if you're not using fresh.

No fresh ginger? Powdered ginger at half the amount works in a pinch, though the flavor won't be as vibrant. Substituting honey for brown sugar (1:1 ratio) keeps the sweetness but loses the caramelized depth during cooking. Vegetable oil is neutral enough not to overpower the dish, but if you prefer, avocado oil has a slightly higher smoke point for wok searing. The cornstarch is critical—it creates that signature velveting effect on the beef. If you're gluten-sensitive, arrowroot powder serves as a perfect substitute. For the green onions, use both white and green parts—the white adds subtle sharpness while the green provides freshness.

Store the flank steak wrapped in parchment paper in the coldest part of your fridge and use within 3 days for optimal tenderness. String beans keep for up to 5 days in the fridge, but they're best used within 2 days of purchase for peak crispness. The homemade sauce components (soy sauce, brown sugar, ginger, garlic) can be pre-mixed and stored in an airtight container for up to 1 week in the fridge. For meal prep, cook the beef and beans separately, then reheat in a wok or skillet with a splash of water to maintain crispness. This dish reheats beautifully—3-4 days in the fridge or 3 months frozen when properly portioned.

Step-by-step instructions for wok-seared beef with crunchy green bean bites

Master this technique and you'll achieve perfectly tender beef with crisp-tender string beans every time.

In a medium bowl, combine the 1 lb flank steak (sliced thinly against the grain), 1 tbsp cornstarch, 1 tsp salt, and 0.5 tsp black pepper. Toss gently until the steak is evenly coated. This cornstarch mixture creates a silky texture that prevents the beef from becoming tough during the high-heat searing.

Let the marinated beef rest for 10 minutes at room temperature. This resting period ensures even cooking and prevents the steak from releasing juices too quickly when it hits the hot wok. The cornstarch will begin to form a thin, protective layer on each slice, which is crucial for that restaurant-quality texture we're after.

Rinse the 1.5 cups jasmine rice under cold water until the water runs clear, then drain well. In a medium saucepan, combine the rice with 3 cups water and 1 tsp salt. Bring to a boil over medium-high heat, then reduce to a simmer, cover, and cook for 15 minutes. Remove from heat and let it steam, covered, for another 10 minutes. This method produces fluffy, individual grains that won't turn mushy when mixed with the stir-fry.

While the rice cooks, prepare the string beans by blanching them. Bring a pot of salted water to a boil and cook the 1.5 lb string beans (trimmed and cut into 2-inch pieces) for 2 minutes. Immediately drain and plunge them into ice water to stop the cooking process. This preserves their vibrant green color and crisp texture. Drain well and pat dry with paper towels before proceeding.

Heat a wok or large skillet over high heat until it's smoking hot. Add 2 tbsp neutral oil and swirl to coat the surface. Working in batches to avoid crowding, add the marinated beef slices and sear for 30-45 seconds per batch until the edges are deep golden brown and the beef is cooked through. Remove the beef and set aside on a plate.

In the same wok, add 1 tbsp neutral oil and swirl to coat. Add the 4 cloves garlic cloves (minced) and 1 tbsp fresh ginger (finely grated) and stir-fry for 30 seconds until fragrant. Pour in the 0.33 cup low-sodium soy sauce and 2 tbsp brown sugar, scraping up any browned bits from the bottom of the wok. Let this mixture simmer for 1 minute until slightly thickened.

Return the seared beef to the wok along with the blanched string beans. Stir-fry everything together for 2-3 minutes until the string beans are heated through and the sauce has coated the beef evenly. The string beans should remain crisp-tender, not mushy—this is where your blanching paid off.

Drizzle in the 1 tbsp sesame oil and toss everything together. Taste and adjust seasoning if needed, adding a splash more soy sauce if the dish seems too dry. The final stir-fry should have a glossy sheen from the sauce, with the beef slices glistening and the string beans holding their shape. Garnish with the 3 whole green onions (sliced) and 1 tsp sesame seeds just before serving.

Divide the cooked 1.5 cups jasmine rice among four plates, creating a base for the stir-fry. Spoon the beef and string bean mixture over the rice, ensuring each serving gets an even distribution of both components. The contrast between the tender beef, crisp string beans, and fluffy rice creates a perfect textural experience.

Serve immediately while everything is hot. The high heat cooking ensures the flavors are vibrant and the textures are just right—crisp beans, tender beef, and aromatic rice. The sauce should cling to the beef and rice, creating each bite with a balance of sweet, savory, and umami notes. Enjoy while the sesame seeds are still toasty and the aromas are at their peak.

Perfect pairings for this recipe

Rice Pairing Perfection

Jasmine rice is my go-to base for this stir-fry—its delicate floral aroma complements the beef's savory depth without overpowering. Cook 1.5 cups uncooked with 3 cups water and 1 tsp salt for perfectly fluffy grains that soak up the sauce beautifully.

For extra flair, try Thai red rice or brown rice for a nuttier contrast. 🍚

Sauce Variations

This recipe's soy-ginger base works wonders, but swapping in 1 tbsp hoisin sauce adds sweet depth, while 1 tsp chili paste brings heat. For umami richness, stir in 1 tbsp fish sauce—just taste first!