Broccoli with Mustard Vinaigrette

I got a new recipe book from my Aunt for Christmas. It is Holly Clegg "Trim & Terrific Cookbook" This is a local chef from Baton Rouge where my Anut is from. here is the first recipe that I tried. We will not be serving this again... '

Ingredients:
1 bunch fresh broccoli, trimmed and cut into florets
1/4 cup finely chopped green onions (scallions)
2 cloves garlic, minced
1/2 teaspoon dried tarragon leaves
1/2 teaspoon dry mustard
1 tablespoon olive oil
1 teaspoons Dijon mustard
1/8 teaspoon salt
1/4 teaspoon freshly ground pepper

Directions:
Place the broccoli in a microwave-safe disj with 1/4 cup water. Cover, and cook 8 minutes, or until the broccoli is tender;drain.
Combine the green onion, garlic, tarragon, and dry mustard in a bowl. Whisk the oil into the green onion mixture. Add vinegar, Dijon mustard, salt, and pepper. Pour vinaigrette over the broccoli, tossing to coat. Serve hot or at room temperature.