Zatarain's Liquid Crab Boil Concentrate contains the essential oils of the spices and seasonings in the original Crab & Shrimp Boil. A capful added to a pot of boiling crawfish, shrimp, crab, potatoes, corn or other vegetables gives them a great flavor too! Use 1 Tablespoon of Zatarain's Liquid Concentrated Crab & Shrimp Boil for 1 dozen crabs or 5 pounds of shrimp or crawfish.