Ember Days are no longer binding, but it is still a good thing to keep the Ember Days. Praying and fasting on Wednesdays, Fridays, and Saturdays was fairly common from early Christian times on, and doing that formally on the Ember Days was seen as an important way of consecrating the seasons and the secular year. (Among other things.)
(It’s possible that some religious communities living a traditional way of life could oblige their members to keep Ember Days out of obedience, but I haven’t heard of that being a thing.)
There was a fair amount of cuisine directed toward Ember Days.
Vegetable tempura, for example, was an imitation of the food that Portuguese traders ate during the “Quatuor Tempora,” the “Four Times” during the year when there were Ember Days.
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“Tart on an Ember Day” is super-yummy, if you like onions. (It’s a savory pie, like chicken pot pie or shepherd’s pie.) I recommend throwing in a close approximation to the recipe and not worrying too much about exact ingredients. The saffron, etc. were for dressing it up for high-class cooking, but making a onion pie with cheese or bread to hold it together? That was something even peasants would do.
My favorite medieval version of this dish is made with lots of mushrooms as well as onions. Mmmmmm.
Adding the sugar and “powder douce” (sweet powder - sugar, cinnamon, ginger, etc.) is very tasty and I love it; but not everybody is ready for eating sweet cheese with their savory mushrooms. So again, make the recipe your own.
(Ignore the bit on the one webpage where the transcriber calls it “Amber Day.” I linked to it for the recipe.)
Picture of the manuscript for the onion version of the recipe.
Arundel MS version of the recipe, with another modern redaction.