Place all the crab boil mix ingredients, except the salt and lemon into a spice grinder and pulse several times.
Fill a large pot with enough water to cover all ingredients. Use 1/2 tablespoon of this mixture plus 1/2 lemon wrapped in cheesecloth per quart of water used for low country boil. Add the boil mix, salt, lemon, and potatoes, and heat until boiling. Adjust the boil seasonings, to taste.
Once boiling, add the sausage. Cook over medium heat for 15 minutes. Add corn and cook for 10 additional minutes. Add shrimp and cook no more than 3 minutes. Drain and serve.