Peel onion and grate on large holes of a grater. Combine everything in a bowl. Whisk until smooth.
Serve with veggies of choice.
Video
Notes
Note 1: I've found Hidden Valley Ranch to deliver the best and most consistent flavor.Note 2: Serve dip with fresh veggies like carrots, bell peppers, cucumbers, cherry tomatoes, celery, broccoli, and snap peas. For more crunch, add pita chips, pretzels, or chips. Sliced baguette or breadsticks are great too.Storage: Keep the dip in an airtight container in the fridge; the flavor actually improves, so it’s great to make a few days early.