This is a two sided inner cover. During the warmer months, the shallow side faces down and it functions as a typical inner cover. There is a hole in the center which can be used for feeding with a mason jar surrounded by an empty hive body.
During the winter, the deep side is used as a mold to pour sugar candy. This faces down and hive moisture, which usually is a problem in the winter, softens the candy so the bees can feed. This puts the feed at the top of the hive, right were the bees will need it when they exhaust their stored honey reserves.
to make the candy:
Bring 7 lbs. of sugar, 1 lb. of water (2 cups), and 1 1/2 lbs. (about 1 1/8 cups) HFCS (or 2:1 sugar water) to a slow boil while stirring until candy consistency is reached about 220 to 230 degrees F. Take the candy off the heat and stir in a 1 lb. of pollen substitute with a whisk. Pour mixture into a mold and allow to cool.
A mason jar can be used to seal and cover the hole in the center and removed once the candy sets.