I think now's an appropriate time to confess that I've been known, when I have a craving for something sweet and don't have much in, to spread a teaspoon each of smooth peanut butter and raspberry jam on a digestive biscuit. However, there was no microwave involved and you absolutely do NOT need any butter or "spread" (probably bleeping lard in guest's case).
I'd completely understand if this revelation was enough for me to be booted out of the canal. However, I'm consoling myself with the fact I don't look like I'm wearing a cowpat on my head, actually know where the state of Georgia is, and don't have a voice that sounds like a cross between Janet Street-Porter and a trapped fart.