Use ripe but firm strawberries to avoid mushiness. Organic berries are preferred. Frozen berries can be used if thawed and drained well. For a low-sugar version, skip the simple syrup or substitute with honey or fresh orange juice. Chill champagne, glasses, and fruit mixture before assembly to maintain bubbles longer. Avoid stirring after pouring champagne to preserve fizz. Prepare the muddled mixture ahead but add champagne just before serving.