Boil the water and season it

• Fill a large stockpot with the water and bring to a rolling boil.
• Stir in the salt, Cajun seasoning, Old Bay and the halved lemon.

Cook the potatoes and sausage

• Add the baby potatoes and cook until just tender.
• Add the sliced smoked sausage and continue boiling.

Add the corn and garlic

• Add the corn pieces to the pot.
• Stir in the minced garlic and cook until the corn is tender.

Cook the shrimp

• Add the shrimp to the pot.
• Boil just until the shrimp turn pink and opaque, being careful not to overcook.

Drain and serve

• Drain everything in a colander.
• Toss with the melted butter and extra Cajun seasoning, then serve hot.