Dark, unsweetened chocolate, caffeine, lemon rind, and some types of fruit are known to be bitter.

In a 2- to 3-quart pot, mix together the sugar, unsweetened chocolate, butter and 1 cup of water.

Like bittersweet and semisweet chocolate, high-quality unsweetened chocolate is now widely available.

When a recipe calls for unsweetened chocolate, a cook should look for 99 or 100 percent on the label.

The 9.7-ounce bars also come in 99 percent cacao, which makes them about the best unsweetened baking chocolate available.

It has maroon and white starlike flowers and smells of unsweetened chocolate.

But it requires fine unsweetened chocolate, labeled 99 percent cacao, not the ordinary supermarket kind.

I remember one time a grateful client paid him in opium, a black stick that looked like a bar of unsweetened chocolate.

In about two months, the company will start selling 3.2-ounce bittersweet bars, and an excellent unsweetened chocolate for baking.

A salmon fillet among the entrees was served with a crust made of olives and unsweetened chocolate.