Creamy Cucumbers

1 cup fat-free milk
1/2 cup reduced-fat mayonnaise
1/2 cup reduced-fat sour cream
1 (1 ounce) package ranch salad dressing mix
2 tablespoons dill weed
1/8 teaspoon celery seed
1/8 teaspoon pepper
2 large cucumbers, peeled and sliced
2/3 cup sliced red onion, separated into rings
Directions
In a small bowl, combine the milk, mayonnaise, sour cream, dressing mix, dill, celery seed and pepper. Stir in the cucumbers and onion. Serve with a slotted spoon.