Add roasted almonds to a high-speed blender or high-quality food processor (using the "S" blade). (see notes)
In most high-speed blenders the process will take about 1 minute while food processors will take 10-15 minutes or more to create a smooth, almond butter. Make sure to scrap down the sides of the blender or food processor often.
Add salt. Let cool. Pour into a glass jar and enjoy! Refrigerate after use.