Lyour (also spelled lyre, layour, lyoure, liour, lyer)

The Middle English Dictionary (https://quod.lib.umich.edu/m/middle-english-dictionary/dictionary) at the University of Michigan, gives this definition for the term. I looked it up on the Internet and could not find any information specific to the term.

"A thickening for sauces, soups, stews, etc.; also, a thickened sauce"

These are the sources they give for the term:

(a1399) Form Cury (Add 5016)p.15 : Make a Lyour of brode blode and vynegre, and do þer to Powdour fort.

(a1399) Form Cury (Add 5016)p.17 : Make a lyre of rawe ayren, and do þerto Safron and powdour douce.

(a1399) Form Cury (Add 5016)p.24 : Set it ouere the fyre and couere it fast; make a layour of brede and blode, and lay it þerwith.

(a1399) Form Cury (Add 5016)p.47 : Take of the self broth and wyne, a layour of brede of galyntyne..cast þat fysshe þerinne and boile it.

?c1425 Arun.Cook.Recipes (Arun 334)433 : Take fylettes of porke, and roste hom tyl thai byn nere ynogh..and chop hom, if thowe wyl, on gobettes, and do therto gode brothe of beef, and drawe up a lyoure of brede steped in brothe and vynegur, and do therto powder of clowes and of maces, and put therto galentyne, and let hit sethe, and colour hit with saunders, and serve hit forthe.

?c1425 Arun.Cook.Recipes (Arun 334)459 : And draw up a liour of chippes of bred, and put in therto.

a1450 Hrl.Cook.Bk.(1) (Hrl 279)20 : Take Conyngys, an fle hem & seþe hem, & make lyke þou woldyst make a sewe saue alle to-choppe hem, & caste Safroun & lyer þer-to, & Wyne.

a1450 Hrl.Cook.Bk.(1) (Hrl 279)33 : Take water & let boyle, and draw a lyer þer-to of Brede, of þe cromys, with wyne y-now.

a1475 Liber Cocorum (Sln 1986)p.31 : Drawʒe a lyoure of blode and brede withalle.

a1475 Liber Cocorum (Sln 1986)p.32 : And make a lyoure of brede and blode, And lye hit þerwithe.

a1475 Liber Cocorum (Sln 1986)p.50 : Drawʒe alyoure of browne crust eke To alye þis sew þat is so meke.

?a1475 Noble Bk.Cook.(Hlk 674)49 : Drawe a liour of bred and red wine, and alay it up.