Grated lemon peel from organic lemons is used to flavor a wide variety of dishes. For example, it adds a nice citrus flavor to many baked goods and sauces.
From Wikipedia: “The lemon (Citrus × limon) is a species of small evergreen tree native to Asia.
The tree's ellipsoidal yellow fruit is used for culinary and non-culinary purposes throughout the world, primarily for its juice, which has both culinary and cleaning uses. The pulp and rind (zest) are also used in cooking and baking. The juice of the lemon is about 5% to 6% citric acid, which gives a sour taste. The distinctive sour taste of lemon juice makes it a key ingredient in drinks and foods such as lemonade and lemon meringue pie.”
For more information about lemons, pleas go to the following link:
--> Lemon, raw, without peel
The peel contains the essential oil citral with limonene (65–70 %), which contributes to the typical lemon flavor. Lemon peel also contains the following: “the bitter-tasting flavonoids neohesperidin and naringenin; the bioflavonoid rutin; hydroxycoumarins, furanocumarins, citric acid, and pectins.*”
“Lemon juice, rind, and zest are used in a wide variety of foods and drinks. ... Lemon juice and rind are used to make marmalade, lemon curd and lemon liqueur. Lemon slices and lemon rind are used as a garnish for food and drinks. Lemon zest, the grated outer rind of the fruit, is used to add flavor to baked goods, puddings, rice, and other dishes.”
Citrus zest: From “https://en.wikipedia.org/wiki/Zest_(ingredient)”; “Zest is a food ingredient that is prepared by scraping or cutting from the outer, colorful skin of unwaxed citrus fruits such as lemon, orange, citron, and lime. Zest is used to add flavor ("zest") to foods.
In terms of fruit anatomy, zest is obtained from the flavedo (exocarp) which is also referred to as zest. The flavedo and white pith (albedo) of a citrus fruit together makes up its peel. The amounts of both flavedo and pith are variable among citrus fruits, and may be adjusted by the manner in which they are prepared. Citrus peel may be used fresh, dried, candied, or pickled in salt.”
“The fungicide enilconazole (commonly known as Imazalil) is a known carcinogen widely used to grow citrus crops. An exposure standard governing the outer skin of a citrus fruit would likely differ from an exposure standard governing the fruit pulp.” For culinary purposes, you should therefore only use the zest from organic lemons.
“Lemon oil may be used in aromatherapy. Lemon oil aroma does not influence the human immune system, but may contribute to relaxation.”
Note (italics): * = Translation from a German Wikipedia entry