Add the celery and the scallions to a bowl with cold water to cover and a couple ice cubes. Allow to soak for 20 minutes.
Drain the celery and scallions and add to a large salad bowl. Combine with the red pepper, asian pear, arugula, lemon juice, Juniper Apple Shrub and olive oil. Toss generously. Top off with the walnuts and blue cheese.