In a blender or food processor, blend all the ingredients together until smooth.
Pour the dressing through a fine-mesh strainer to remove seeds if desired.
Store the dressing in an airtight container for up to 7 days in the refrigerator.
Notes
Grape Juice: Use 100% white or red grape juice. Straining: It is NOT necessary to strain this dressing, as long as the raspberry seeds do not bother you. To Use as a Marinade
For Chicken: Place defrosted or fresh chicken into a resealable bag. Pour ½ cup dressing over chicken, seal bag, and toss to coat both sides of chicken with dressing. Marinade for anywhere from 2 to 24 hours before grilling or baking. (I find 8-12 hours is best)
For Fish: Place defrosted or fresh fish into a shallow container and pour dressing over fish, turning to coat both sides of fish with dressing. Marinade for 20-30 minutes before grilling or baking.