Note: This is additional material for my column in the Althing, a newsletter published by the Barony-Marche of the Debatable Lands, a branch of the Society for Creative Anachronism located in Pittsburgh, PA.
Timeline

Extended Recipe Listing
(from medievalcookery.com)
I did not provide links, but you can find these recipes by using the search function at Medieval Cookery
From Ancient Cookery [Arundel 334] (England, 1425) – Joutes on flesh day
From A Book of Cookrye (England, 1591) – To boyle a Cony with a Pudding in his Belly, A Pudding in Egges, A Pudding in a Tench, To poche Egges in broth.
From Een notabel boecxken van cokeryen (Netherlands, ca. 1510 – C. van Tets, trans.) – Another Green Sauce
From Forme of Cury (England, 1390) – Eowtes Of Flessh
From Koge Bog (Denmark, 1616 – Martin Forest, trans.) – XXVII – To salt beetroot
From Das Kuchbuch der Sabina Welserin (Germany, 16th century – V. Armstrong, trans.) – 202 To make smoked tongue
From Libro di cucina / Libro per cuoco (Italy, 14th/15th c. – Louise Smithson, trans.) – LXXI – Elderflower dish
From Le Menagier de Paris (France, 1393 – Janet Hinson, trans.) – (several) BEET SOUPS, Soup from beet-leaves, And note that to make beet soup using milk of almonds, BLACK BEET SOUP is made with bacon riblets, An herbal dish or two of eggs, TO MAKE A TART
From A NEVV BOOKE of Cookerie (England, 1615) – A Fridayes Pye
From A Noble Boke off Cookry (England, 1468) – Wortis
From Ouverture de Cuisine (France, 1604 – Daniel Myers, trans.) – Firstly the cabbage flowers
Complete List of References
Ibn Botlân, The Medieval Health Handbook: Tacuinum Sanitatis, (New York: George Braziller, 1976), Color Plate IV.
Ilaria Gozzini Giacosa, A Taste of Ancient Rome, (Chicago: University of Chicago Press, 1994), 13, 140.
Jean-Louis Flanderin, and Massimo Montarnari, Food: A Culinary History, (New York: Columbia University Press, 1999), chap. 11.
Melitta Weiss Adamson, Food in Medieval Times, (Westport, CT: Greenwood Press, 2004), 9.
Petronius Arbiter, The Banquet of Trimalchio from the Satyricon.
R.H.M. Langer, and G.D. Hill, Agricultural Plants, 2nd Ed., (Cambridge, UK: Cambridge University Press, 1991), 197-199.
Stephan’s Florilegium, MSG-Beets.
Texas A&M AgriLife Extension, Vegetables: Beets.
Titus Petronius, The Satyricon, Vol. 2.