Both the orange juice and the sparkling component must be fully chilled. Warm mimosa = flat, sad, amateur.
In a large pitcher, combine the fresh orange juice and the non-alcoholic sparkling wine or ginger ale in a strict 50/50 ratio. Add the pinch of fine sea salt and stir very gently once or twice — just enough to integrate without killing carbonation.
Fill glasses with ice if desired (traditional mimosas are served without). Pour the mimosa mocktail and garnish with orange slices and optional fresh raspberries. Serve immediately.