Tu BiShvat (Hebrew for the 15th day of the Hebrew month of Shvat) is the new year of the trees.
This recipe is adapted from the King Arthur Flour Cookie Companion's recipe for Bakery Date Squares.
One favorite dish of the Ashkenazim that survived the move from the shtetl to North America was the hearty mushroom-potato-barley soup called krupnick.
Jewish communities around the world marked the "new year for the trees" last week with tree planting ceremonies and seders that celebrate Israel's seven species (wheat, barley, grapes, figs, pomegranates, olives and dates if you are keeping track!).