1/2 cup Strawberry Vinegar
freshly ground black pepper
light olive or vegetable oil
bottle white balsamic vinegar or Champagne vinegar
Combine all ingredients in a small jar; seal tightly, and shake to blend.
Pulse strawberries and sugar in a food processor until finely chopped. Transfer berries and juice to a large bowl; stir in vinegar. Cover and let stand 2 1/2 hours.
Strain berries and juice through a double thickness of rinsed and squeezed dry cheesecloth; discard solids. Transfer liquid to a bottle with a tight-fitting lid. Store in refrigerator up to 3 weeks.