Balsamic Asparagas

40 spears asparagas
2 tablespoons butter
2 teaspoons soy sauce
1 teaspoon balsamic vinegar

Spray pan with cooking spray. Place asparagas on pan. Spray asparagas with cooking spray, salt and pepper. Put in 400 degree F oven for 12 minutes. Melt butter, remove from heat and add soy sauce and vinegar. Pour over asparagas.