First, craft the firedish, then place the block on the plate, hold the igniter and right-click to start burning the block and get another block. For example, from brick to clay, returning to the material before crafting.

Liquids may also be generated. For example, if water is generated, you can use the bucket and right-click to get the water bucket. If you use an empty bottle for liquid honey, it will be a bottle with honey. If you use NetherRock for crimson and magma, you can make crimson blocks and magma blocks.