Boil water with 2 lemons, old bay seasoning, onion, garlic, lemongrass, and ginger. Once boiling, simmer for 15 minutes.
Next, add the potatoes and cook for 5-10 minutes. I got smaller red potatoes, so I boiled it for closer to 5 minutes.
Add the sausages and corn and cook for another 2-3 minutes.
Add shrimp and cook for 1-2 minutes until orange and opaque.
Remove the shrimp, potatoes, sausage, and corn from the broth. Reserve 1 cup of broth.
Mix the reserved broth with butter. Pour into a small bowl and serve on the side. You also have the option to pour it over the shrimp and other ingredients.
Cut the remaining lemon into wedges. Garnish the shrimp boil with parsley and serve with lemon wedges.