Gumbo is a stew or soup originating in Louisiana, an found across the Gulf Coast of the United States and into the U.S. South. It consists primarily of a strong stock, meat and/or shellfish, a thickener, and the vegetable "holy trinity" of celery, bell peppers, and onion. The soup is traditionally served over rice. A traditional lenten variety called gumbo z'herbes (from the French gumbo aux herbes), essentially a gumbo of smothered greens thickened with roux, also exists.