How to Make It
Place first 7 ingredients in a large bowl, tossing to combine. Cover with plastic wrap; chill 8 hours or overnight. Drain; rinse well. Drain.
Combine vinegar, oil, oregano, red pepper, celery seeds, and garlic in a bowl, stirring with a whisk until blended. Pack vegetable mixture into 1 (2-quart) jar; pour vinegar mixture over. Add up to 1/2 cup water as needed to cover vegetables. Cover; refrigerate 3 days. Drain before serving.