Wikipedia
Gofio is the Canarian name for flour made from roasted grains (typically wheat or certain varieties of maize) or other starchy plants (e.g. beans and, historically, fern root), some varieties containing a little added salt. Gofio has been an important ingredient in Canarian cooking for some time, and Canarian emigrants have spread its use to the Caribbean (notably in Cuba, Dominican Republic, Puerto Rico, and Venezuela) and Western Sahara. It is also found in Argentina, Uruguay, and Chile, where it is known as harina tostada and is employed in a wide variety of recipes. The gofio commercially available in the Canary Islands is always finely ground, like ordinary flour, despite the definition given in the Spanish Dictionary of the Royal Academy.
Gofio is thought to have been the main staple of the diet of the Guanches, the original inhabitants of the Canary Islands, who produced it from barley and the rhizome of certain ferns. The latter is also known to have been used in historical times, especially in famine, even up till the 20th century. "Gofio" derives from the name for the product in the aboriginal language of Gran Canaria, while in neighbouring Tenerife it was known as ahoren. Among the Berbers of North Africa, from whom the Guanche population largely derived, there existed a toasted barley flour with similar usage as a food, called arkul. In Morocco, toasted flour is also mixed with, among other ingredients, almond paste, honey, argan oil, anise, fennel, and sesame seeds to make "sellou" (also called "zamita" or "slilou" in some regions), a sweet paste known for its long shelf life and high nutritive value. It was amongst the provisions of the crew of Thor Heyerdahl's "Ra II" expedition to cross the Atlantic aboard a papyrus ship using the Canary Current in 1970.
Flours made from toasted grains are also known in other gastronomies worldwide, notably Tibetan tsampa. Roasting the grain before milling has the advantage of destroying mold and mold toxins, allowing poorly stored grain to be used, as well as improving flavour by producing more complex sugars. The traditional roasting process, at temperatures typically much higher than those used for malt barley in the brewing industry, for example, also has the effect of partly breaking down the starch and proteins, making them more digestible.
Gofio in the Canary Islands is currently produced from cereals of several types, as well as pulses. Maize and wheat are the most common cereals used, but various mixes of these with rye, barley, etc., are also readily available in shops. Gofios of chickpeas and lupin beans are also produced in Fuerteventura, as well as from other wild plants occurring there.