Beef Stir-Fry with Crunchy Veggies and Peanut Sauce

Combine the ingredients for the sauce by whisking them together in a medium-sized bowl until they form a uniform mixture. \nPrepare the stir-fry by heating 1 tablespoon of peanut oil in a large skillet over medium-high heat until it reaches the smoking point. \nCook and stir the beef in hot oil until it is browned on all sides, approximately 3 minutes. \nTransfer the beef to a plate lined with paper towels using a slotted spoon.\nAdd an additional 1 tablespoon of peanut oil to the remaining drippings in the skillet and heat it until almost at the smoking point. \nStir-fry a variety of vegetables, including carrots, bell pepper, mushrooms, broccoli, green onions, ginger, and garlic in the hot oil-drippings until they are tender, roughly 4 minutes. \nReturn the beef to the skillet and clear a space in the center of the pan. \nReduce the heat to medium-low and pour the vinegar mixture and cornstarch mixture into the cleared space. \nStir the ingredients together for a few seconds, then combine them with the vegetables and beef. \nCover the skillet and cook until the sauce thickens and coats the beef-vegetable mixture, approximately 5 minutes.