Cream the butter using a hand mixer or a stand mixer.
Add the brown sugar and beat until the mixture is light and fluffy.
Add the eggs and beat to combine.
Mix in the flour mixture in three batches, beating well after each addition.
Add the pine nuts and chocolate and stir just to incorporate.
Divide the dough into four portions and set each portion on a piece of wax paper or plastic wrap.
Shape the dough into 2-inch (5 cm) diameter rolls. Wrap well in the wax paper or plastic wrap, twisting both ends to seal shut.
Refrigerate for at least 2 hours.
Preheat the oven to 325°F (160°C).
Slice each roll into 10 to 12 cookies. Place the cookies on parchment paper–lined baking sheets. Bake for 9 to 12 minutes, depending on whether you like a softer cookie or a crisper one.
Notes
Using sushi mats to shape the dough into rolls will enable you to create perfectly round cookies.
The cookie rolls will keep refrigerated for up to 1 week, or frozen for up to 6 months. Thaw the rolls in the refrigerator for 24 hours before slicing.