Cook the white rice the day before making Cajun fried rice. Add rice, chicken stock, 1 tablespoon butter, and 1 tablespoon of your favorite Cajun seasoning to a rice cooker. Or, cook rice on the stove according to package instructions, replacing the water with chicken stock and adding the butter and seasoning.
When rice is done cooking, allow it to cool then transfer it to a baking sheet. Fluff the rice with a fork, and refrigerate covered overnight.
The next day when you're ready to make the Cajun fried rice, prep vegetables and meat. Chop vegetables and cut andouille sausage into bite sized pieces. Set to the side.
Add thawed peeled and deveined shrimp to a large bowl and sprinkle with Cajun seasoning. Toss to combine. Add 1 tablespoon minced garlic to the bowl with the shrimp. Set the shrimp bowl to the side.
Add about 1 tablespoon of butter to the preheated griddle and begin to cook the andouille sausage, tossing frequently. When sausage is about halfway cooked through, move it to the side of the griddle to continue to cook.
Add another tablespoon of butter to the center of the griddle. Cook all vegetables except for green onions in the butter. Use your bench scraper or spatula to direct the leftover sausage grease into the vegetables for extra flavor. Saute vegetables until about halfway cooked through, then move to the side of the griddle.
Add another tablespoon of butter to the center of the griddle. Add cooked refrigerated rice to the butter and begin to cook, tossing frequently. Continue to flip the sausage and vegetables periodically while they are cooking on the side of the griddle.
When rice is cooked to your liking, add cooked vegetables and sausage. Toss to combine and cook a few more minutes.
Move Cajun fried rice to the side of the griddle to make room to cook the shrimp.
Place shrimp down on the griddle and allow to cook for about 2-3 minutes on the first side to develop a nice crust. Then, saute shrimp until cooked through.
Add the cooked shrimp to the Cajun fried rice and toss to combine. Cook a few more minutes until done to your liking.
Transfer Cajun Shrimp Fried Rice to a serving bowl. Sprinkle with the sliced green onions and serve.