It's complicated to do correctly, and takes some practice, but it's probably one of my favourite methods. You can eat dope if you heat it first to activate the cannaboids, which are also fat and alcohol soluble. This is much more efficient than smoking it, as none is wasted, and it gives a longer stone. Also, it eliminates the carcinogenic effects of smoking it. The most popular method is to sautee some ganja in some butter on medium heat for awhile, and then using the butter to cook.
Standard ratio is one eighth of an ounce of ganja to a stick of butter.
It is also possible to extract the active ingredients from dope by soaking them in a strong alcohol. The cannaboids are alcohol soluble, so they dissolve into the alcohol. The remaining solids can then be strained out and the mixture drunk, with the same effects as eating it. Let it sit at sub-boiling for 20 minutes or so and then drain it out. A popular drink using Green Dragon is 1 oz.