Fill pot 1/2 to 5/8 full of water, add crab shrimp boil mix, garlic, Tabasco sauce, lemon juice and the lemons cut in half. Bring to a boil and add potatoes, onions and corn; boil for about 10 to 15 minutes or until tender. Add shrimp and cook for a couple of minutes. Shrimp must not be over cooked or it hardens.
Serving: On a long table, e.g. 10"x6" feet covered with newspapers or butcher paper, dump this mixture. Guests will gather around and eat right from the table. The only thing the hostess needs to have is plenty of napkins, silverware, and an empty container for cobs and shelling. Paper plates or bowls.
After dumping the contents save the water in the pot and return spices and lemon for the next batch. For each additional batch add 1 shrimp crab boil mix, 1 ounce garlic juice, 2 ounces Tabasco sauce, 6 ounces lemon juice and 2 more lemons. You will cook as many batches for as many guests as you have.
Normally this is pretty filling, but a nice toss salad and fresh fruit salad can be served.