Prawn cocktail in the context of Nigel Slater

Shellfish, in colloquial and fisheries usage, are exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms. Although most kinds of shellfish are harvested from saltwater environments, some are found in freshwater. In addition, a few species of land crabs are eaten, for example Cardisoma guanhumi in the Caribbean. Shellfish are among the most common food allergens.

Due to narrowing in the meaning of the English word fish over the centuries, shellfish no longer fall under what is usually considered fish. Most shellfish are low on the food chain and eat a diet composed primarily of phytoplankton and zooplankton. Many varieties of shellfish, and crustaceans in particular, are actually closely related to insects and arachnids; crustaceans make up one of the main subphyla of the phylum Arthropoda. Molluscs include cephalopods (squids, octopuses, cuttlefish) and bivalves (clams, oysters), as well as gastropods (aquatic species such as whelks and winkles; land species such as snails and slugs).

Mexican cuisine consists of the cuisines and associated traditions of the modern country of Mexico. Its earliest roots lie in Mesoamerican cuisine. Mexican cuisine's ingredients and methods arise from the area's first agricultural communities, such as those of the Olmec and Maya, who domesticated maize, created the standard process of nixtamalization, and established foodways. Successive waves of other Mesoamerican groups brought with them their cooking methods. These included the Teotihuacanos, Toltec, Huastec, Zapotec, Mixtec, Otomi, Purépecha, Totonac, Mazatec, Mazahua, and Nahua. With the Mexica formation of the multi-ethnic Triple Alliance (Aztec Empire), culinary foodways became infused (Aztec cuisine).

Today's food staples native to the land include corn (maize), turkey, beans, squash, amaranth, chia, avocados, tomatoes, tomatillos, cacao, vanilla, agave, spirulina, sweet potato, cactus, and chili pepper. Its history over the centuries has resulted in regional cuisines based on local conditions, including Baja Med, Chiapas, Veracruz, Oaxacan, Lebanese Mexican and the American cuisines of New Mexican and Tex-Mex.