Oh mamma! I have to give this a try sometime soon. Coffee is life. Coffee is love. Coffee keeps me sane. 
I wonder if the grounds were not used primarily for their flavor, per say, but like poppyseeds and flax seeds. If I remember this, I may attempt it with some Seattles Best Henry’s Blend, as it’s not as fine as espresso, but finer than regular coffee grounds. Plus, using the instant coffee, too. (Remember, Coffee is life, 
)