Food Network teaches how to crush, slice and mince garlic. Peel off some of the papery skin from the garlic and then smash the head of garlic with the heel of your hand to loosen the cloves; if you only need a few cloves, leave the head intact and pull some off. Separate the cloves. To peel a clove, cut away the root end with your knife. Lay the flat side of the knife over the clove while holding the knife handle, then with the heel of your free hand carefully whack the knife against the garlic to separate the skin from the clove. To crush the peeled garlic, lay the flat side of the knife over the clove and smash it again. To slice peeled garlic, lay the clove flat on the cutting board and hold it with the fingertips of one hand, keeping them curled under. Using a rocking motion with the knife, make thin slices by moving the knife slowly across the clove. To mince peeled garlic, lay the flat side of a knife over the clove and smash it. Roughly chop the clove then move your free hand flat across the tip of the knife and use a rocking motion to chop the garlic until it’s finely minced.
For the shrimp stock: toss the shrimp shells in a large pot and fill with water. Bring the water to a boil, turn off the heat and let sit for at least 15 to 20 minutes, although longer is fine. Strain the shells and discard.
Coat a large, wide pot with olive oil and bring to medium-high heat. Add the andouille and cook for 4 to 5 minutes, or until the sausage starts to brown. Add the peppers, celery, and onion to the pan, season with salt and a pinch crushed red pepper. Cook 7 to 8 minutes or until the mixture has softened and is very aromatic. Toss in the garlic and cook for 2 to 3 more minutes. Add the tomatoes and cayenne. Stir in the rice.
Add 4 cups shrimp stock, bay leaves, and thyme bundle. Season with salt and taste it to make sure you are on the way to something delicious. Cover and cook over medium heat for 25 minutes.
Stir in the shrimp and cook for another 5 to 7 minutes or until the shrimp turn pink. Serve garnished with chopped scallions.