Mustard Sauce with Honey and Spices
Libellus de arte coquinaria: An Early Northern Cookery Book. 13th Century Rudolf Grewe, and Constance B. Hieatt.

IX Item de aliis. Mal aftær sinup oc lat til thrithi deld hunugh oc tyndæ deld aniz oc slikæ tu kaniæl, oc mak hænnæ mæth goth ædikæ oc lat i læghæl. Thæt ær got thre manæth.

9. Another One Next grind mustard [seeds] and add a third part of honey, and a tenth part of anise and twice as much cinnamon, and grind it with good vinegar and put it in a cask. It is good for three months.

2/3 C
Yellow Mustard Seeds
1/4 C
Scant C Wildflower Honey
1 1/2 C
Apple Cider Vinegar
1 T + 1 pinch
Ground Anise
2 T + 2 pinches
Ground Cinnamon

Measure mustard seeds into a coffee grinder and process until as fine as desired. Transfer mustard to a food processor and add honey and spices. Process mixture until combined and then add 1 C of vinegar. Transfer to a sealed container and allow to sit overnight. On the next day add the remaining 1/2 C of vinegar or until desired consistency is achieved.