Trim fat from lamb or beef. Partially freeze meat. Thinly slice across grain into bite-size strips. Set aside. Cut any large mushrooms in half. Set aside.
Pour cooking oil into a wok or large skillet. (Add more oil as necessary during cooking.) Preheat over medium-high heat. Stir-fry garlic in hot oil for 15 seconds. Add onions; stir-fry for 3 minutes. Add mushrooms, squash, and basil; stir-fry for 3 to 4 minutes or until vegetables are crisp-tender. Remove vegetables from the wok.
Add meat to the hot wok. Stir-fry for 2 to 3 minutes or until cooked through. Return cooked vegetables to the wok.
Add undrained tomatoes, drained beans, salt, and pepper. Stir all ingredients together. Cook and stir for 3 to 4 minutes more or until slightly thickened. Serve immediately over hot cooked pasta. Garnish with basil sprigs, if desired. Makes 4 to 5 servings.