Definition of "sallet"

At Hampton Court, sallets for archers on horseback, sallets with grates, and old sallets with vizards: At Windsor, salettes and skulls: At Calais, saletts with vysars and bevers, and salets with bevers.

1786, Francis Grose, A Treatise on Ancient Armour and Weapons, page 11

Ursula wore that day a hauberk under her gown, and was helmed with a sallet...

1896, William Morris, The Well at the World's End, Book IV, Chapter 29

I remember one said there were no sallets in the lines to make the matter savoury nor no matter in the phrase that might indict the author of affection, but called it an honest method, as wholesome as sweet, and by very much more handsome than fine.

c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act II, scene ii], lines 378-383

To make Sallet of Lemon pill, or green Citron. You must have your Lemon Pill preserved very green, Rasp it into a Dish, and raise it up lightly with a Fork […]

1682, A perfect school of Instructions for the Officers of the Mouth