1. Place the <Ohitashi Sauce> ingredients in a microwave-safe bowl and cover with a vented microwave lid. Cook on HIGH (1200W) for 30 seconds. Take out and stir until the chicken bouillon dissolves.

2. In a microwave-safe bowl (4 liter or 4 quart), place the tips of Romaine lettuce leaves in first and have the stem ends on top. (This will cook the lettuce evenly.)

3. Place a plate that can fit in the bowl, directly on top of the lettuce, and cook on HIGH (1200W) for 4 minutes.

4. Take out and divide the lettuce on serving plates and sprinkle the <Ohitashi Sauce> over the top.

For how long you should cook with your microwave oven, see Cooking Time vs Wattage Conversion.
For more tips of using Microwave Oven, see Sachiko's Guideline to Microwave Cooking.