a crumbly cake
It's a traditional recipe from Mantua, dating back to the 17th-century court of the Gonzaga family, and now popular throughout Lombardy and northern Italy: a simple cake (or tart, or cookie), with lots of butter in the dough to make it crumbly. It's often flavoured with lemon zest, or almond, or both. Many recipes have a ricotta filling. It's easy to make; here's a recipe.