Add potatoes to a large pot and cover with water. Add salt. Bring to a boil for 12 minutes or until potatoes are just tender but still firm.
Cool potatoes in fridge for at least one hour. (Tip: make ahead and leave in the fridge overnight.)
Mix together all ingredients except for shrimp and potatoes to make the marinade.
Toss shrimp and potatoes in marinade and let sit in fridge for minimum of 30 minutes.
Assemble skewers and grill for 10 to 15 minutes, until shrimp is cooked through.