PREPARATION:

1. Trim leaves from broccoli stalks. Cut broccoli into florets. Peel stems, then cut crosswise into 1/4-inch pieces to make "buttons."
2. Place steamer basket in large saucepan; add 1 inch of water. (Water should not touch bottom of basket.) Place buttons in steamer; top with florets. Cover; bring to a boil over high heat. Steam 4 to 6 minutes or until bright green and crisp-tender, adding more water if necessary.
3. Meanwhile, combine cornstarch and lemon juice in small saucepan. Stir in water and bouillon. Cook over medium heat until mixture thickens and begins to boil, stirring constantly.
4. Arrange buttons around edge of warm serving plate. Place florets in center. Drizzle with sauce; season with pepper to taste. Garnish with lemon wedges and mizuna greens.