Add the orange slices, lemon slices, honey, and the pinch of fine sea salt to a large glass pitcher (about 3 liters). Gently muddle just until some juice is released and the honey dissolves. Do not pulverize the fruit — crushed citrus = bitter sangria.
Add the fresh orange juice and red verjus to the pitcher. Stir gently to combine. The liquid should already taste bright, lightly tannic, and dry.
Cover and refrigerate for at least 1 hour, ideally 2–3 hours. This resting time is non-negotiable — it’s where citrus oils, verjus tannins, and honey lock together.
Just before serving, add the chilled club soda. Stir gently once or twice only, enough to integrate without killing carbonation.
Fill glasses with ice, pour over the virgin Spanish sangria, and garnish with orange peel twists.