To prepare dressing: Place orange zest and juice, vinegar, oil, oregano, mustard, salt and pepper in a jar. Cover and shake to combine. (Makes about 1 cup.)
To prepare salad: Combine bell peppers, broccoli, carrots, radishes and onion in a medium bowl. Add 1/2 cup of the dressing and toss to coat. Refrigerate until ready to serve. (Refrigerate extra dressing for up to 1 week.)
Make Ahead Tip: To make ahead: Cover and refrigerate dressing for up to 1 week.
1 1/2 vegetable, 1/2 fat