Half fill a large stockpot with water. Add seasoning and bring to a boil. Add potatoes, return to a boil for five minutes. Add sausage and onions and boil on medium heat for 15 minutes. Add corn, bring water back to a boil and cook another 10 minutes or so. Add shrimp, bring back to a boil once more and cook until the shrimp turn pink, around three minutes. Drain through a colander
and serve on a large platter.