Recipes
All the meat can be made out of there corresponding meats in a 3x3 using the crafting table.
Alternatively the cooked variants can be made in the crafting bench or be cooked using a furnace, smoker, or campfire.
The fish cube is the only one with a none standard crafting recipe, the fish cube can be crafted using any combination of cod, salmon, or the tropical fish.
Usage
All meat cubes are made to be eaten like cake, with 8 bites a block. (To make up for the lost meat going from 9 to 8, the bites from the cube will have higher saturation than there meat counterparts.)