Beef Stir Fry with Ginger Sauce

Meat
3/4 pound beef cut in small strips

1 tablespoon soy sauce
1 tablespoon dry sherry

Vegetable Categories: Use any combination from each of the four batch categories below for a total of 1 1/2 pounds)
carrots , cauliflower, onions, or peppers (first batch)
asparagus , green beans, broccoli, or butternut squash (second batch)
cabbage , celery, chard, fennel, mushrooms, peas, sugar snap peas, summer squash, or zucchini (third batch)
scallions , fresh herbs, tender greens, or tomatoes (fourth batch)

Remaining Ingredients
2 tablespoons chopped scallions , white part only
1 tablespoon minced garlic
1 tablespoon minced fresh ginger
2 - 4 tablespoons canola oil or peanut oil

Sauce
3 tablespoons soy sauce, light style if available
1/2 teaspoon granulated sugar
1 tablespoon dry sherry
1/4 cup minced fresh ginger
2 scallions , minced
2 tablespoons low-sodium chicken broth

1. Toss meat with soy sauce and sherry in medium bowl; set aside. Combine all sauce ingredients in a second small bowl. Divide vegetables into two or three batches according to ingredient list.
2. Heat 12- or 14-inch nonstick skillet over high heat, 4 minutes (pan should be so hot, you can hold your outstretched hand 1 inch above its surface for no more than 3 seconds); add 1 tablespoon oil (add 2 tablespoons for tofu or fish) and rotate pan so that bottom is evenly coated. Let oil heat until it just starts to shimmer and smoke. Check heat with hand. Drain meat, seafood, or tofu, then add to pan and stir-fry until seared and about three-quarters cooked (about 20 seconds for fish, 60 seconds for meat, 2 minutes for tofu, 2 1/2 to 3 minutes for chicken). Spoon cooked meat or seafood into serving dish. Cover and keep warm.
3. Let pan come back up to temperature, 1 or 2 minutes. When hot, drizzle in 2 teaspoons of oil, and when oil just starts to smoke, add vegetables from first category. Stir-fry until vegetables are just tender-crisp, about 2 minutes. Leaving first batch in pan, repeat with remaining vegetables, cooking each set of vegetables until tender-crisp, or for fourth category, wilted. Add about a teaspoon of oil for each new batch (amount of oil will depend on skillet you are using—nonstick pans require about a teaspoon; other pans may require 2 teaspoons). Clear center of pan and add garlic, ginger, and scallions. Drizzle with 1/2 teaspoon of oil. Mash into pan with back of a spatula. Cook for 10 seconds. Remove pan from heat and stir garlic/ginger mixture into vegetables for 20 seconds.
4. Return pan to heat and add cooked meat, seafood, or tofu. Stir in sauce and stir-fry to coat all ingredients, about 1 minute. Serve immediately with rice.