“Greek nut cookies” is the only proximation of a translation I could find for the mysterious word karithata. In The Joy of Cookies the recipe is entitled pistachio-jam cookies, and one of the main ingredients is finely chopped toasted pistachios. another is honey. A Google search for karithata recipes turns up a few. They all call for either chopped almonds or pecans, and powdered sugar instead of granulated. No pistachios and no honey.
The honey is strong in these cookies, in a good way, and they are rich with butter. I used raspberry jam in some and orange marmalade in the rest. I think I like the orange better, but the raspberry sure is pretty. Sharon Tyler Herbst suggests rose petal jam as another alternative… but I think maybe not.