Instructions
Step 1
Remove the strings from the celery using a peeler, cut into 2 inch (about 5 cm) lengths, then slice thinly lengthwise. Peel the grapefruit and remove the segments.
Step 2
Soak the celery in water to crisp it, then drain well.
Step 3
Combine the celery and grapefruit in a bowl, add the vinegar, and toss to combine.
Tip
Since the mixture can become watery over time, combine with the vinegar just before serving.