This is one of my three favorite Chinese dishes. Equally good with ground beef. In this day and age, I expect some people to dry fry the green beans in a hot skillet, but deep frying them quickly doesn't add much if any oil and it draws out the moisture nicely. Another possibility would be to toss the trimmed green beans with a tablespoon of peanut oil and roast at 500 degrees F for 10 to 15 minutes. The idea is to get moisture out of the beans so they will absorb the sauce. Prepare ingredients ahead of time and this will come together quickly. To tell the truth, I double or triple the garlic, scallions and ginger, and use half to 3/4 teaspoon hot bean paste, but this is more or less the original recipe. Feel free to adapt to your taste. I like spicy but not hot. The prep time does not include mincing, chopping, trimming the vegetables.