A white dish called "Diamond"

Translation of a 16th century Italian Recipe.

From Christoforo di Messisbugo, Banchetti composizioni di vivande e apparecchio generale (Lucio Spineda, Venice, 1610)

p76v A fare mangiare bianco detto Diamante, di cui se ne poute seruire, da grasso, e da magro per piatti dieci. (To make a white dish called Diamond, to cook it to be able to serve, for fat days, and for lean days, for ten plates.)

Take two glasses of good cows' milk, six ounces of starch flour, and mix these together well, a little at the time, and one pound of good white sugar, and put these things together on the fire, on a tripod in a good pewter scoop, like is used for white dish, leave it to boil for the space of half an hour stirring all the time, and when it is cooked, throw in half a pound of fresh butter, and a little rose water, and take it from the fire, and when it is served put over fine saffron.