Could not bring myself to use walnut oil in a recipe with pecans - used vegetable oil instead. No idea why it would need time to thicken since it was nearly dry when I finished mixing. Doesn't spread much, so I flattened A LOT. Since the dough was already dark when mixed, it was difficult to gauge when done. Certainly not the prettiest cookie on the platter - more like cookie rocks.
Very interesting twist on oatmeal cookies and more flavorful using maple syrup than sugar.