I cut their throats, my daughter held the pan …

I cut their throats, my daughter held the pan
Betwixt the stumps, wherein their blood then ran;
And then I ground their bones to powder small,
And made a paste for pies straight therewithal.
Then with their flesh I made two mighty pies,
And at a banquet served in stately wise
Before the Empress set this loathsome meat,
So of her sons’ own flesh she well did eat.