Cook the noodles according to package directions until tender, then pour into a colander in the sink and run under cold water for a few minutes until cooled.
While the noodles are cooking, whisk together the sour cream, lemon juice, dill and garlic.
Dump the cooled noodles into a bowl, then add the chopped veggies and pour the dressing over. Toss to coat.
Sprinkle it with salt and pepper, then toss again.
Cover and chill for 1 hour. If chilling for longer than an hour, you may need to stir in more dressing.
Notes
Storage: Store in an airtight container in the refrigerator for up to 2-3 days, stirring in extra dressing before serving if needed.