Easy Mongolian Beef Stir-Fry

aka The Sticky Situation

My oldest asked me once why we never order Chinese takeout anymore. I told him it’s because I cracked the code on Mongolian beef one random Tuesday night, and now nobody in this house wants the delivery version. The sauce — sticky, sweet, a little bit savory — coats every slice of steak like velvet. I make this at least twice a month, and my kids literally fight over the last pieces. The best part? It takes less time than waiting for a delivery driver.

Ingredients

• 1½ lbs flank steak, sliced thin against the grain (about ¼-inch strips)
• ¼ cup arrowroot starch (for coating the beef)
• 3 tablespoons avocado oil, divided
• 4 cloves garlic, minced
• 1 tablespoon fresh ginger, finely grated
• ⅓ cup coconut aminos
• 3 tablespoons coconut sugar
• 1 tablespoon pure maple syrup
• 1 tablespoon toasted sesame oil
• ½ teaspoon crushed red pepper flakes (optional)
• ½ cup water
• 1 tablespoon arrowroot starch mixed with 2 tablespoons cold water (slurry)
• 5 green onions, cut into 2-inch pieces
• 1 tablespoon sesame seeds, for garnish
• Steamed white rice, for serving

Instructions

1. Prep the steak: Pat the sliced flank steak dry with paper towels. Toss the strips in ¼ cup arrowroot starch until evenly coated. Shake off any excess — you want a light, even dusting, not clumps.
2. Sear the beef: Heat 2 tablespoons avocado oil in a large skillet or wok over high heat until the oil just begins to shimmer. Add the steak strips in a single layer (work in two batches to avoid crowding). Sear for 2 minutes per side until golden and crispy on the edges. Transfer to a plate and set aside.
3. Build the aromatics: Reduce heat to medium. Add the remaining 1 tablespoon avocado oil to the same skillet. Add the minced garlic and grated ginger, stirring constantly for about 30 seconds until fragrant — don’t let it burn.
4. Make the sauce: Pour in the coconut aminos, coconut sugar, maple syrup, toasted sesame oil, red pepper flakes (if using), and water. Stir to combine and bring to a gentle simmer. Let it bubble for 2 minutes until the coconut sugar is fully dissolved.
5. Thicken the glaze: Give the arrowroot slurry a quick stir, then pour it into the sauce while stirring. The sauce will thicken within 30–60 seconds into a glossy, sticky glaze.
6. Toss the beef: Return the seared steak strips to the skillet. Toss everything together, coating each piece in that gorgeous sauce. Add the green onion pieces and stir for another 30 seconds until just wilted but still vibrant.
7. Serve: Plate over steamed white rice, sprinkle with sesame seeds, and serve immediately while the glaze is still sticky and hot.

Tips

• Slice against the grain — this is the single biggest factor in tender beef. Look for the lines running through the steak and cut perpendicular to them.
• Freeze the steak for 20 minutes before slicing — it firms up just enough to get those paper-thin cuts easily.
• Don’t skip the arrowroot coating — it creates that crispy exterior that holds the sauce beautifully. Cornstarch works too if that’s what you have.
• High heat is key for the sear. If the pan isn’t screaming hot, you’ll steam the beef instead of searing it.
• Leftovers reheat well in a skillet over medium heat with a splash of water to loosen the sauce back up.