There are three main types of stroopwafels.

Igneous, the most common, are formed by melting a sticky filling and pouring it between two waffles.

Sedimentary stroopwafels are commonly encountered at the bottom of a large container of igneous stroopwafels.

The rarest form is the metamorphic stroopwafel, formed by subjecting igneous and/or sedimentary stroopwafels to extremes of heat and pressure until they fuse together.