This will yield an almond butter with a 'stone-ground' or 'slightly chunky' texture.
For a smoother result, put the almond butter into a Vitamix. Blend for about a minute at high speed, using the tamper, until it's a homogenous texture.
Recipe by Fit and Fed at http://fitandfed.net/2012/03/24/homemade-almond-butter/