Beet Sauce
Ein New Kochbuch. Marx Rumpolt. 1581, Transcribed by Dr. Thomas Gloning; Translated by Gwen Catrin von Berlin.

3. Rote Ruben eyngemacht mit klein geschnittenen Merrettich/ Aniss/ Coriander/ und ein wenig Kuemel/ sonderlich wenn die Ruben geschnitten/ gesotten mit halb Wein und halb Essig.

Red beets preserved with small cut horseradish/ anise/ coriander/ and a little caraway/ special if the beets are cut/ marinated in half wine and half vinegar.
1 lb
Beets, steamed and peeled
9 oz
Horseradish, peeled & coarse chop
2 t
Anise
2 t
Coriander
1 t
Caraway
1 C
Red Wine
1/4 C
Apple Cider Vinegar

Place beets and horseradish into a food processor. Process until finely shredded. Transfer mixture to storage container and add spices and liquids. Stir well and store in refrigeration.