Instructables user Mongpoovian shows us how to make slabbed ganache truffles:

Slabbed ganache is exactly what it sounds like – ganache, set into a slab. It’s an easy way to make truffles that contain multiple types and flavors of filling together to produce a most interesting chocolate-consuming experience. In this instructable, I’ll be showing you how to make kona coffee/marshmallow truffles, but the procedure can be used for all sorts of fillings.