Holding at the twisted part, position bag vertically over baking tray. Pipe a dot and pull up to form a tip. The first few dollops will be the most concentrated in color, and the color will fade as you use the meringue and refill the bag. Fill one to two baking trays with meringues. Place tray(s) in preheated oven. Bake for 1.5 to 2 hours, or until the meringues are firm to the touch but not browned yet. Turn off oven, open door slightly and leave meringues in the warm oven for another two hours. Let cool and keep in a sealed container until ready to serve.