The oven is a functional block in 8Bitmmo, it can be bought from the store for 1 plat. Putting a block of sand on the oven, and turning the oven on. Will turn it into glass. Doing this with grass will turn it into dirt.[CIT] The oven can be used to cook the steak item. The same way you would cook anything else. However the steak cooks over time.
Sprite of the Oven, in the shop menu.