Two pounds of shrimp shells will give this stock the flavor you need when making our Shrimp-and-Crab Gumbo.
Melt shortening in a stockpot over medium heat. Add all remaining ingredients. Cook, stirring often, 10 minutes. Add 3 quarts water, and cover; bring to a boil over high heat. Reduce heat to low; simmer, uncovered, 1 hour. Strain; discard solids. The stock may be kept in the refrigerator for up to 2 days, or frozen up to 3 months.