Make the butter ahead of time, if you like. Roast the asparagus and toss it with the butter just before serving.
3 tablespoons finely chopped shallots
2 tablespoons butter, melted
2 tablespoons balsamic vinegar
1 teaspoon chopped fresh thyme
3/4 teaspoon salt
1/2 teaspoon grated lemon rind
2 pounds asparagus spears
How to Make It
Combine shallots, butter, vinegar, thyme, salt, and rind, stirring well with a whisk.
Preheat oven to 450°.
Snap off tough ends of asparagus. Arrange asparagus in a single layer on a jelly roll pan coated with cooking spray. Cover with foil; bake at 450° for 5 minutes. Uncover and bake an additional 10 minutes or until asparagus is crisp-tender. Pour butter mixture over asparagus, toss gently to coat. Serve immediately.