With a vegetable peeler remove a 2 by 1-inch piece of zest from 1 of the oranges, being careful not to peel off any of the white pith. Cut into thin strips and set aside.
Cut about 1/2 inch off of the top and bottom each piece of fruit. Remove the peel and pith from each piece of fruit by standing it on its end and cutting down along the curve of the fruit. Slice the fruit into 1/4 inch thick rounds and arrange on a platter.
In a small bowl combine the maple syrup, lemon juice and cinnamon. Pour the dressing over the fruit, garnish with the zest and serve.