As chicken is cooking, peel and de-vein shrimp, saving the shells. (your local market may do this for you) Rinse shrimp then cover and put in fridge.
Put shrimp shells in a 2-3 qt. pot add 1 1/2 qts. water, 1 large bay leaf, 1 tsp. crushed red pepper, 1 1/2 tbsp. Zatarain's Crawfish,Shrimp & Crab Boil (just cut the bag open), and 1 tsp. cajun/creole seasoning. Cut lemon into quarters then squeeze juice into shells and add the spent lemon,too. Bring to boil then reduce to med. low heat.