Make a “buttermilk” mixture by mixing milk, lemon zest, and water in a small bowl and set aside. Combine all remaining dry ingredients in a medium mixing bowl and whisk well. Add the yogurt, maple syrup, vanilla and buttermilk mixture and whisk the dry ingredients until a dough forms. You don’t need to make the dough completely smooth or lump-free. Preheat a greased griddle over medium heat and place 1/4 cup of batter on your grill and cook the flatbread for 3 to 4 minutes or until golden and turn to the other side for about 2-3 minutes or until golden. Repeat this process with the remaining pancake batter. After cooking, serve as you wish.