Preheat oven to 180C / 350F. Place orange juice, sugar and grated orange rind in a saucepan, bring to the boil and simmer for 5 minutes. Turn off heat and allow to cool. Beat orange mixture with butter until well combined. Beat in eggs one at a time. It may not look very smooth, but this is not a problem. Stir in sifted flour and mix in cream and lemon juice. Pour mixture into a greased cake tin and bake in preheated oven for about 50 - 60 minutes. Remove cake from oven and after 5 minutes unmould onto a cake rack to cool. Spread cake with Orange and Grand Marnier icing or simply dust with icing sugar. Orange and Grand Marnier Icing: Melt butter with grated orange zestand remove from heat when just melted. Mix butter preparation with sifted icing and slowly stir in Grand Marnier. Stop stirring when the icing is a spreadable consistency. You may not need all of it. Per serving: 346 Calories (kcal); 17g Total Fat; (43% calories from fat); 2g Protein; 47g Carbohydrate; 89mg Cholesterol; 144mg Sodium Food Exchanges: 0 Grain(Starch); 0 Lean Meat; 0 Vegetable; 1/2 Fruit; 3 Fat; 3 Other Carbohydrates Converted by MM_Buster v2.0n.