You cant cook but you can smelt. When you right click it, a screen will appear. Put either wood, (any wood but no wood planks or sticks) or coal in the bottom box. then put an ore (ex. Diamond ore, Gold ore, Iron Ore, Emerald Ore...) in the top box. an arrow will slowly fill to the side, pointing at a box. When the arrow is finished, the result will be inside that box (ex. Diamond, Gold Ingot, Iron Ingot, Emerald...). If you place more than 1 ore, when one is finished, it will automatically start smelting the next until the fuel is out. The fuel is marked by a flame which slowly decreases. when it decreases completely, the ores will stop smelting right where they are and will start again when more fuel is added. the best fuel is coal. If you put wood in the top box, coal will result.
Or, if you find clay, put clay in the furnace instead of an ore. when finished, a brick will result. 4 bricks in a square will make a brick block.
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Cook your baby in a furnace.
Throw it in the furnace just like iron or other ores.
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.
Use these fuels Wood Sticks Wood logs Coal Lava The best thing to use to cook things are/ is coal
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.