Preheat oven to.
Get two half aluminum pans.
Put a bag of potatoes in each.
Add 8 oz mushrooms and garlic per pan.
Mix water and 1/4 cup Cajun seasoning and split that between both pans.
Add lemons and a dusting of more seasoning per pan.
Cover with foil and bake for 25 minutes.
Add sausage and corn.
Bake for another 25 minutes.
Add shrimp and butter per pan and bake for 10 minutes, then season one last time and enjoy.