This beautiful cake is pretty quick and easy to dazzle your family with just a little labor of love. The unique ingredients in this cake are ripe and plentiful at this time of year: clementines! Their juice and zest give a pop of brightness that will delight your palate. Smith's Sour Cream inside the batter makes the cake incredibly moist ... and would you believe there's sour cream in the frosting, too? Dress it up with fancy garnishes for your holiday gatherings or let the kids help decorate it for a weeknight treat!