Old family recipe. The hint of orange zest sells it. This photo is actually the raw dough before cooking, but the final cookies look pretty similar; just a bit browned around the bottom edges.

Mix the sugar, shortening, orange zest, vanilla, eggs, and salt together (I use an electric mixer for this). Then, add in the flour and rolled oats. Continue mixing until it is too stiff for the mixer. Continue mixing with a large spoon until there is no dry oatmeal. Pour in the chocolate chips and stir until they are uniformly distributed.

Use two spoons to place on un-greased cookie sheets. Don't smooth them down; they should look rough and random like in the photo. Bake @ 375° ~14 minutes. Cool on racks or a paper towel. Makes 40-50 cookies.

***
WARNING: I have a hard time not eating huge quantities of these when they are still warm, to the point where I generally miss a meal because I'm still full. Have a friend restrain you physically, if necessary.