Mongolian Beef

Slice flank against the grain after the bath, not before. Flank's fibers are coarse and run lengthwise, so cutting across them turns chewy into tender. A 30-degree angle makes the slices wider and thinner, perfect for catching the sticky sauce.

Cornstarch is non-negotiable. Toss the cooked beef in cornstarch right before searing - it creates the slightly crispy edge that distinguishes Mongolian beef from a stir-fry. Don't bread it; just a light dusting that turns translucent in the oil.

Sous vide at 130°–135°F for 2–3 h. Mongolian beef wants medium-rare interior with hot caramelized exterior - the contrast is the whole point. Anything over 140°F and you've lost the textural play.

Sauce should be cooked separately, not in the bag. Reduce soy, brown sugar, garlic, and ginger in a hot wok until it's sticky and lacquered, then toss the seared beef in for 30 sec. Sauce in the bag steams the meat instead of glazing it.

Anti-tip: don't skip the green onions. The white parts go into the sauce, the green tops get tossed in at the very end for crunch and color. They're not garnish - they're a structural ingredient. Real Mongolian beef is half scallion by volume.

Cornstarch coating creates velvety texture

Use dark soy sauce for richer color and flavor

High heat wok creates best sauce coating

Add a splash of water when reheating to refresh sauce

Great for meal prep - holds well for 3–4 days

Double the sauce recipe for extra saucy version