Microwave cooking

Very often when I am cooking food I will use a ceramic clay cooking bowl with a Pyrex glass lid and a microwave. What I do is I put prepared vegetables into the bowl without any water. Then I put the bowl with the lid on in the microwave for 12 & ½ minutes or 15 minutes if the vegetables are frozen. I like the way the water released from the vegetables steam cooks the veg. There is nowhere for the heat to go quickly so it builds up inside the bowl, the steam gets heated more and more and blasts the veg and escapes the lid under pressure. To me this is a very efficient way to cook vegetables. When the vegetables are done, I make some gravy and pour it onto the vegetables. I don't like using the hob to cook food because the heat escapes very quickly.