Quoted from cory: "actually, when i first got my pans, i just started cooking in them and let the seasoning accrue on its own
if you're planning on cooking some bacon any time soon, thats a great way to get it going
or frying anything. just cooking with a good bit of fat works great"
You know this makes sense. When people first started using cast iron pans, they didn't have an oven to season it with. They just started using them.