Sprouting your own Sprouts

Step 3 Exactly this Much

Put a cup or so of beans in the tub. Half full is way too much. They'll swell up and overflow the top, Rodents will feast and overpopulate, and plague will strike your village.
I think our spies sometimes use sprouts as a time-delay fuse to push a button on their bombs.
Anyway, don't put too many seeds in the jar.
If you don't use enough seeds you'll go hungry, also they seem to like company and turn out a lot better when the jar gets crowded.