Tomorrow is the Solemnity of the Annunciation!
It is a No Penance Friday! Good Christians have a duty to feast, even to eat swan, if you can get it. Though some medieval authorities would claim that as it lived in water it was a fish: liberals, we have had with us always. So have it as a fish course and perhaps something meatier afterwards.
Here is a recipe for the sauce:
Chaudon. Tak þe issu of þe swan & wasch it wel, & scoure þe guttes wel with salt, & seth þe issu al togedere til it be ynow, & þan tak it vp and wasch it wel & hew it smal, & tak bred & poudere of gyngere & of galyngale & grynde togedere & tempere it with þe broth, & coloure it with þe blood. And when it is ysothe & ygrounde & streyned, salte it, & boyle it wel togydere in a postnet & sesen it with a litel vynegre.