1 cup cocoa powder
1 cup sugar
1/8 tsp salt
1/2 cup water
Recipe
Simply whisk together in a large glass measuring cup (one-quart is a good size) a cup of Cocoa powder and a cup of sugar, and 1/8 tsp. salt. Add to this 1/2 cup of water and stir well. Microwave on High in the glass measuring cup for a minute, watching carefully. This mixture must come to a full boil, but it tends to boil over rapidly, so watch like a hawk and stop the microwave if it bubbles to the top of the glass container. Stir to make sure all sugar is dissolved, and allow to cool until you can comfortably dip a finger in. Taste it.
If it's not thick enough, add more cocoa and sugar mix. If it's too thick, add a TOUCH more water. Reheat.
Finally, if it seems to lack something and you can't quite put your finger on it, try adding a tiny bit more salt. You don't want it to be salty, but that bit of salt is very necessary to avoid a flat, unrich taste.
Pour it into a squeeze bottle with nozzle and cap (I use a Servin' Saver Rubbermaid Mustard/Ketcup Container) and refrigerate. It makes AWESOME chocolate milk, and when poured on ice cream, turns even thicker and more gooey. Keeps pretty much indefinately. (But you'll use it long before you ever find out how long it keeps!)