Fill a large pot with water and bring it to a boil. Cut the lemon in half; slice one half into the pot with the Old Bay and garlic, and reserve the other half.
Drop in the potatoes and cook for about 10-12 minutes until they are just fork-tender.
Add the corn and sausage, cooking for an additional 5-6 minutes.
Finally, add the shrimp, boiling for 2-3 minutes or until they turn pink.
Drain the ingredients and serve on a large platter for a classic shrimp boil experience.
Squeeze the reserved lemon half over the drained shrimp boil before serving.