From the article:

…in al-Masʿūdī’s tenth-century Murūj al-Dhahab, a poem by the famous Abbasid poet of Baghdad Ibn al-Rūmī (d. 896) describes how to construct a sandwich, which he calls wasṭ (وسط), in which the stuffing is put between two layers of bread. Here is how he describes it:

    You, seeker of delicious food, take a couple of fine breads, round and thick,
    The likes of which no one has seen, Slice off the top crusts, 
    so that you make them thin.
    Spread on one, finely minced grilled chicken, delectable and delicate, 
    which a mere puff would melt.
    On this arrange lines of almond intersected with lines of walnut.
    Let its dots be cheese and olive, and its vowels mint and tarragon,
    Now take boiled eggs, and with their dirhams [egg white] 
    and dinars [egg yolk] the wasṭ adorn.
    Give it a dusting of salt, but not much; just what it needs.
    And inspect it with your eyes for a second or two, 
    for the eyes have a share in it, too.
    Look at it appreciatively until your eyes have their fill, 
    then cover it with the other bread, and eat it with joy.