Combine soy sauce, 2 Tbsp. sherry, vinegar, hoisin, chili garlic sauce, brown sugar, and ½ tsp. cornstarch in a bowl.
Whisk together 2 tsp. sherry and 2 tsp. cornstarch in a bowl; add steak and toss to coat.
Steam broccolini in ¼ cup water in a wok, covered, over high heat until crisp-tender, 5 minutes. Transfer broccolini to a plate; wipe the wok dry.
Heat 2 tsp. oil in the wok; add steak and cook until brown but slightly pink, about 2 minutes. Transfer steak to a plate.
Add remaining 2 tsp. oil to the wok; stir in mushrooms, carrot, and onion, and cook until vegetables begin to soften, about 2 minutes. Stir in garlic and ginger and cook until fragrant, 30 seconds.
Add broccolini, steak, and soy sauce mixture; cook until sauce is thick and syrupy, about 1 minute. Top servings with sesame seeds.
Courtesy of: cuisineathome.com
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