Tequila is Mexico's national spirit. Like all other alcoholic products, it is derived from fermentable sugar. But tequila is unique in that its source of sugar is the Blue Agave plant. The Blue Agave is a dramatically beautiful plant of blue colouring, similar in look to a giant aloe. It can reach a height of six feet and although it looks like a cactus, it is in fact a member of the Lily family. At the heart of the Blue Agave is the "pi'a" - similar in appearance to a pineapple - which produces the "aguamiel" or "honey water" that is the source of tequila.