Just about anything. - Not exactly, there is a variety of things you can cook, but not too much.
Raw Food - Cooked Food
Ores (I.e. Iron ore) - Ingots
Cobblestone - Stone
Logs - Charcoal (Same as coal, but easier to obtain)
Etc.
You put cobblestone in a furnace with something to cook it with
Throw it in the furnace just like iron or other ores.
Cook your baby in a furnace.
Cook sand inside of a furnace. Sand not Sandstone.
To cook raw porkchop on Minecraft you need: 1. Raw Porkchop 2. A furnace 3. Fuel for the furnace First right click on the furnace. Then Insert fuel into the bottom box in the furnace screen. Insert the raw porkchops into the top box, it will begin to cook.
To access a furnace in minecraft, simply click it!!!! Its that easy!!
Like the PC and Xbox versions of Minecraft, you need 8 blocks of cobblestone to craft a furnace. You also can only craft a furnace with a crafting table, which requires 4 wooden planks to craft.
Press E. It should leave the furnace GUI.
A bucket of lava in a furnace can smelt/cook 100 items, so it can cook just over a full stack and a half of food. That's compared to coal, which cooks 8 per piece.
You can't...
To mine diamonds in Minecraft, you have to use an diamond or iron pick. Click and hold with your mouse on the diamond ore until it breaks. A block of diamond should come out of it and into your inventory. Then you have to cook it in your furnace to get diamonds.
You automatically get 1