Well, if I'm in a hurry I'll bite straight in and eat them in a couple of mouthsful, but to savour the great Cake of Jaffa properly, I swirl my tongue round and round the chocolate covering of the orangey bit, until it's all melted and licked off. Then I either nibble gently around the edges to get at the rest of the chocolate, then bite into the vestigal sponge topped with the orangey bit, or if I'm feeling adventurous, I slip my tongue around and beneath the edges of the orangey bit, carefully loosening it so that it eventually slips onto my tongue to be savoured as it melts. Then I return to the chocolatey base and bite gently at it, feeling the sponge give as my teeth close around it.
Did I mention I like Jaffa Cakes?
If they create that affect, I'm Jaffa Cakes' biggest fan.