Do you have a blender? If so, try putting the pecan butter in the blender. You may have to scrape the sides and push it into the blades a bunch, but it should work. I've had good luck with blender pecan and peanut butter, but not almond butter--it always still has chunks in it. If your DS has trouble with almond meal, you may just have to buy commercial almond butter, or try the pecan butter if you can get that fine enough.