Whisk together the vinegar, olive oil, fresh orange juice, Dijon, salt, pepper and orange zest. Refrigerate.
Combine the cucumbers, tomatoes and red onion. Keep refrigerated.
About 30 minutes before serving, add the dill and drained pickled beets. Toss gently.
Fold in the orange pieces just before dressing the salad.
Add the vinaigrette a little at a time and toss gently. You may not need every drop. Taste and adjust the salt and vinegar.