She bought the thinly sliced marinated beef at Super H Mart, a huge Asian grocery store. It's often made with ribeye or sirloin. I don't know what this particular cut was. Here's the meat, mixed with soy sauce, garlic, ginger, a little sesame oil. The carrots are mixed in with this bowl since they'll take longer to cook than the other veggies.
Here are more scallions, mixed with the giant bean sprouts. They were sauteed separately.
The bean sprouts were also cooked over high heat. We all agreed after dinner that the bean sprouts could have been cooked longer. They were still very crunch. Good, but crunchy.
And the finished dish, which was served over rice. It was so good that even the fussy eater in my house cleaned his plate. Three times.