Using a vegetable peeler, peel strips thinly from 2 oranges; remove any white pith from strips with the point of a sharp knife; cut strips into thin julienne strips.
With sharp knife, peel oranges removing all white pith; cut oranges horizontally into 4 slices for easy serving; reshape oranges and hold together with small wooden skewers.
Place orange strips in small pan, cover with water, bring to boil, boil uncovered 10 minutes, drain; combine sugar and water in pan, stir over medium heat until sugar has dissolved; add orange strips to this mixture.
Boil the syrup gently, uncovered, approximately 10 minutes or until orange strips are transparent and glazed; remove strips immediately from pan, place on lightly oiled plate.
Return pan to heat, boil syrup uncovered further 5 minutes or until syrup turns pale golden brown; remove from heat immediately, quickly add extra water, stir for a few minutes to dissolve toffee.
Return to heat and stir for a few minutes extra to dissolve any remaining toffee in bottom of pan; remove from heat, allow to cool a few minutes then stir in Grand Marnier and lemon juice; allow syrup to cool 5 minutes.
Pour cooled syrup over oranges, add glazed orange strips, cover with plastic food wrap, refrigerate several hours or overnight; remove wooden skewers from oranges just before serving; serve orange topped with the orange strips and with some of liqueur syrup.