You can get this from crafting any items to a total of 50. Most of my 50 were straw blocks which are made using wheat that comes from mining corn looking crops. There is some in the starting garden which needs a little time to mature, and then can be mined to give you wheat and also a seed to plant more. The general starting area also has lots growing around.
I went with this strategy as I wanted to repair the straw roof on the starting house.
Obviously you can use any items you want for this as it will easily come over time