1. In a small frying pan, combine salt and Szechuan peppercorns; cook over medium heat, shaking pan often until salt begins to brown and peppercorns become fragrant, 8-10 minutes.
2. Cool mixture. Grind with mortar and pestle or with spice grinder. Strain mixture to remove hulls.
3. Place salt and Szechuan peppercorn mixture and remaining ingredients in a blender or food processor. Blend until smooth.