These little beauties are used to bake apples in the microwave. Just prepare the apples as you normally would (ie core, stuff with sultanas, add dab of butter and slit skins) place the apples inside containers and turn on microwave. I used them for the first time yesterday and followed the instructions - had the most delicious apples in less than 4 minutes. Saves the fuel used to bake in oven. I bought these through a well known catalogue whose head office is up in the Lake District.