If you don't want to flavor your cake with this tasty liqueur consider serving it over some French Vanilla Ice Cream or over fresh fruit. The uses for Grand Marnier at your wedding are limitless. Talk to the chef at your venue for more ideas to incorporate the orange flavor of Grand Marnier into your wedding menu. Use it to glaze chicken? Make salad dressings, the list just goes on and on.
If you just enjoy Grand Marnier at home, try this link for a recipe for DIY orange liqueur. Have the fun of making it and then enjoy drinking it or cooking with it.