Chinese-Style Brussels Sprouts with Hoisin Glaze

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2 tablespoons peanut oil or vegetable oil
3 tablespoons minced fresh ginger
1 onion, chopped
3 garlic cloves, thinly sliced
2 pounds small Brussels sprouts, washed, ends trimmed, then bulbs cut into halves
3 tablespoons mirin (Japanese rice wine)
1 tablespoon low-sodium soy sauce
7 to 8 tablespoons hoisin sauce
Toasted sesame oil

In a large wok or frying pan on medium-high heat, add peanut oil. When oil is hot, add ginger and onion. Stir, and cook for about 2 minutes. Add garlic, stirring to prevent burning, about 1 minute more. Add Brussels sprouts and mirin. Cook for about 5 minutes, stirring regularly, until Brussels sprouts start to become tender. Stir in hoisin sauce. Continue to cook for about 2-3 minutes more. Drizzle with a little sesame oil, and serve.