Egg Cream: Both Egg and Cream, Discuss

So you know how New Yorkers are all like, try our egg creams! They don’t have egg or cream in them! So crazy! Perhaps even crazier, here’s a recipe (again from The Standard Formulary) for an egg cream with egg AND cream:

Syrup, Egg Cream.
Cream fl. oz. 16
Syrup fl. oz. 48
Extract of vanilla fl. dr. 4
Yolks of 16 eggs.

Rub cream with egg-yolk until perfectly smooth, then add the syrup and flavoring. This is to be served like any other soda syrup, but before handing over, sprinkle a little mixed spice on the foam.

So who wants to blow through a whole bunch of eggs with me?