One unexpected ingredient in the batter is lemon juice, which brightens up this cookie dough. These cookies are flawless, but if you can't find some of the ingredients at the store, you can easily make substitutions. For example, I've made these before with sliced almonds and steel-cut oats instead of walnuts and rolled outs. I also swap out the semi-sweet chocolate chips with white chocolate chips sometimes I make these at home. These cookies expand as they bake, so one tip for first-time bakers is to be follow the instructions for spacing before you pop your dough into the oven.