Louisiana Fish Fry Boil-n-a-Bag 3 oz. Crawfish, Shrimp & Crab BoilJust toss in a bag of this seasoning, and let the whole herbs and spices work their magic. To a large pot, add enough water to cover seafood, 4 Tbsp. salt and 1 bag of Crawfish, Shrimp & Crab Boil. Bring to a rolling boil, add seafood, and return to a boil. Boil crabs 20 minutes, crawfish 15 minutes and shrimp 2 minutes. Remove from heat and soak 5 minutes. For added flavor: Add halved lemons and cayenne pepper prior to boiling water. One bag seasons 4 lbs. Crawfish or Shrimp, or 1 dozen Crabs.