What's the difference between George Michael and a microwave oven? = A microwave stops when you open the door.

Overcooked again? Most microwave recipes give you a range of cooking times; choose the shorter duration then check for doneness to avoid overcooking.
Veggie cooking 101. Plastic wrap is the best for covering veggie because it wraps tightly, holding in heat and steam. Pol Martin, author of Supreme Cuisine suggests puncturing the wrap to allow steam to escape, preventing it from splitting. Fresh greens cook quickly with minimum water, so they retain their nutrients, taste, colour and texture.
Cooking speed varies. Dense foods cook more slowly than porous ones. E.g., mashed potatoes cook much faster than baked potatoes and ground beef quicker than steak, says Ann Creber, recipe author for World’s Finest Foods.
Containers. Shallow round and oval shapes allow the most even cooking. Square and rectangular ones may cause food to overcook in the corners because more energy is absorbed there