SERVES 4

Dressing the greens before cooling infuses them with more flavor than simply pouring and tossing.

1 tbsp. rice wine vinegar
1 tbsp. nam pla (Vietnamese fish sauce)
Salt and freshly ground black pepper
1⁄2 cup light sesame oil
1 shallot, peeled and sliced into thin rings
1 lb. choy sum

1. In a small bowl, whisk together rice wine vinegar, nam pla, and salt and pepper to taste. Slowly drizzle in sesame oil, whisking constantly to make a smooth vinaigrette. Add the shallots and set aside for at least 1⁄2 hour. Adjust seasoning before using.

2. Trim ends of choy sum. Peel the thicker stems, then steam until tender, about 15 minutes.

3. Transfer to a serving plate and pour vinaigrette over hot greens. Serve warm, or chill and serve cold later.