I just got done baking these cookies and enjoy them!! The only substitute I made was using 4 tsp of lemon juice in place of the lemon zest–I didn’t have any lemons or oranges on hand. As a side note: If you are expecting these cookies to come out with the texture of a basic sugar cookie, you’re going to disappoint yourself. For me, these cookies almost have a tea-cookie-like consistency; melt-in-your-mouth and creamy/thick.