Chocolate is a favorite for kids and adults alike. Chocolate bars, chocolate fudge, chocolate cake, chocolate chip cookies, chocolate ice cream, chocolate milk, chocolate cereal, Hot chocolate, chocolate sauce... There is something special about this amazing substance - so special that the average American eats 10 pounds of chocolate every year!

Have you ever wondered where chocolate comes from? In this edition of How Stuff Works we'll enter the amazing world of chocolate so you can understand exactly what you are eating!

The Cocoa Bean
Chocolate starts with a tree called the cacao tree (Theobroma cacao). This tree grows in equatorial regions, especially in places like South America, Africa and Indonesia (see this page for a nice map).

The cacao tree produces a fruit about the size of a small pineapple (see this page for some great pictures). Inside the fruit are the tree's seeds, also known as cocoa beans.

Raw Chocolate
The beans are fermented for about a week, dried in the sun and then shipped to the chocolate maker. The chocolate maker starts by roasting the beans to bring out the flavor. Different beans from different places have different qualities and flavors, so they are often sorted and blended to produce a distinctive mix.

Once roasted and blended, the beans are ground, and the ground beans form a viscous liquid called chocolate liquor (the word liquor has nothing to do with alcohol - that's just what it's called). All seeds contain some amount of fat, and cocoa beans are no different. However cocoa beans are half fat, which is why the ground beans form a liquid. If you have ever ground up peanuts to make real peanut butter, that is similar - real peanut butter is a thick liquid. The difference between peanut oil and cocoa oil is that peanut oil is liquid at room temperature while cocoa oil is a solid up to about 90 degrees F. Chocolate liquor is pure, unsweetened chocolate. Eaten in this state it is pretty nasty because it is bitter, but it is possible to aquire a taste for it.

You can do two different things with chocolate liquor. You can pour it into a mold and let it cool and solidify. This is unsweetened chocolate. Or you can press it in a hydraulic press to squeeze out the fat. When you do that, what you are left with is a dry cake of the ground cocoa bean solids and cocoa butter (useful in everything from tanning products to white chocolate). If you grind up the cake you have cocoa powder. You can buy both unsweetened chocolate (baking chocolate) and pure cocoa powder at the grocery store. What you are buying is ground cocoa beans, either with or without the cocoa butter!

Making Chocolate
You can see that, so far, we haven't really done anything - we've taken the seeds of a tree, roasted them and ground them up. Now the process of making the chocolate we eat can begin, and it takes a lot of talent. There are three basic things that must be done by the chocolate maker to make a chocolate bar:

• Adding ingredients - the chocolate that we eat contains sugar, other flavors (like vanilla) and often milk (in milk chocolate). The chocolate maker adds these ingredients according to his or her secret recipe.
• Conching - a special machine is used to massage the chocolate in order to blend the ingredients together and smooth it out. Conching can take as long as 3 days in the finest chocolates.
• Tempering - tempering is a carefully controlled heating process. According to the Chocolate FAQ, tempering is "a process where the chocolate is slowly heated, then slowly cooled, allowing the cocoa butter molecules to solidify in an orderly fashion." Without tempering, the chocolate does not harden properly or the cocoa butter separates out (like cream separates from milk).

Types of Chocolate

Links

• Harvesting cocoa beans - great pictures!
• The story of chocolate - very complete
• Chocolate FAQ - in particular, a very good description of tempering
• How to make your own chocolate
• What is chocolate?
• The taste of chocolate - great chart!
• What, a chocolate shortage?
• Sweet science: Chocolate may really be a 'love drug' for the brain
• Nutrient Profiles for Selected Candy
• Chocolate caffeine content - see also How Caffeine Works
• The Omanhene Cocoa Bean Company