If in town in Sakon Nakhon on the weekend lunch usuallly takes place across from Somdet Phra Srinakarindra Park. Somtom, now with my favorite "heavy on the tomatoes", chicken, sticky rice (missing from the pictures and a beer. Posrk skin and or peanuts also occasionally make the mix. Also avaulable is a fish which is no problem as well. The chicken dipping sauce is hot or not, up to you.
If you are in town it is easy enough to find and it's right there for you to point at if you need to. The prices are right as well. Enjoy!