Over medium heat, place the red wine vinegar and sugar in a small pot. Stirring often, cook until the sugar has completely dissolved, about 3-4 minutes. Remove from heat and stir in sparkling rose, lemon juice, and tarragon.
Place sliced cantaloupe in a sealable container and pour pickle liquid over the top. Allow to cool at room temperature, then seal and refrigerate for 24 hours.
Storage:
Store refrigerated in an airtight container for up to 5 days.