1. Combine 1 teaspoon oil, garlic, scallion whites, and grated ginger in small bowl. Combine 1/4 teaspoon salt, 1/8 teaspoon red pepper, and sugar in second small bowl.

2. Heat remaining 2 teaspoons oil in 12-inch nonstick skillet over high heat until just smoking. Add snow peas, sprinkle with salt mixture, and cook, without stirring, 30 seconds. Stir and continue to cook, without stirring, 30 seconds longer. Continue to cook, stirring constantly, until peas are crisp-tender, 1 to 2 minutes longer.

3. Push peas to sides of skillet; add scallion mixture to clearing and cook, mashing with spatula, until fragrant, about 30 seconds. Toss to combine scallion mixture with vegetables. Transfer peas to bowl and stir in rice vinegar and scallion greens. Season with salt and pepper, and serve.