Temperature is key: Ensure all ingredients, especially the champagne, are thoroughly chilled. This prevents the champagne from going flat too quickly and maintains optimal taste. Gentle mixing: When adding the sparkling wine, pour it gently down the side of the pitcher to preserve effervescence. Avoid vigorous stirring at this stage. Balance of flavors: The specified juices offer a tropical, sweet-tart profile. Adjust the ratio of orange juice concentrate or add a touch of lime for brightness if desired, depending on the sweetness of your nectar. Garnish: Elevate presentation with fresh fruit garnishes like orange slices, pineapple wedges, or a few fresh berries in each flute. Champagne choice: A dry (Brut) or Extra Dry sparkling wine works best to balance the sweetness of the fruit juices. Avoid demi-sec or sweeter varieties unless a very sweet mimosa is desired.