Chop the orange (leaving the skin on). Slice the strawberries. Add both to the bottom of a pitcher, sprinkle with sugar and stir. Let them stand for 20 minutes at room temperature.
After 20 minutes, pour in the rosé wine and brandy. Add the fresh mint and lemon rounds. Stir and refrigerate 1 to 4 hours. (Don’t go beyond 4 hours or the fruit texture starts to degrade.)
Pour the sangria into ice filled glasses and top with a splash of sparkling water (if desired). Add fruit to each glass, preferably on long skewers for easy snacking.