Versatile amaretto ('the little bitter one') is a key ingredient in many other desserts and cocktails. Made from an infusion of apricot kernels (armelline) and/or bitter almonds, it dates back at least to the 16th century (see Disaranno), invented, or so they say, when Leonardo da Vinci's student Bernardino Luini came to paint the church in Saronno, the cradle of amaretto.
Luini, they say used an attractive young widow from the town as his model for the Madonna; they became lovers, and she gave him a rare gift: apricot kernels soaked in brandy. Hence amaretto and amaretti
Image by Infrogmation of New Orleans