It's really easy. Step one: place baby in jumperoo.
Isn't this thing hideous? I knew he would love it.
Then you cut up some organic vegetables, unless you are a monster, in which case you can cut up conventional vegetables, and steam them in the microwave until fork-tender.
Then you puree the bejesus out of the steamed veggies and spoon them into ice cube trays.
Once the veggies are frozen, pop them out of the trays and into freezer bags. That's it. I didn't even mess up the kitchen, which felt weird.
As for actually feeding the baby these things, that's up to you. Henry was a lot more interested in chewing on the spoon, but I think he'll get the hang of it.