Flax is a great substitute for egg in dense baked goods, like cookies, brownies, and pancakes. This little instructable shows how to prepare the flax step by step with pictures and video.
Submitted by Ace Monster Toys Hackerspace in Oakland, CA for the Instructables Sponsorship Program
Step 1: Grind the flax seeds
If you're grinding flax seed from scratch you'll need a spice grinder or a coffee mill. This is a coffee mill that I use for spices and never for coffee, because coffee has a strong flavor. If you already have a coffee grinder and you want to use it for flax seed or other spices: wash out the inside with warm soapy water; rinse to get rid of the soap; then rinse with a little white vinegar. There should only be a faint smell of coffee left.
Once you have a clean dry grinder, simply put the flax seeds in and grind for about 30 seconds. I find it grinds better if there's at least two tablespoons of seed, so I may end up with more than the recipe calls for.