Making flavored vinegar is surprisingly easy. This raspberry vinegar has turned out to be one of our favorites.
Simply fill a jar about 3/4 with fresh raspberries (I have never tried it with frozen, so not sure how that would work). Then fill with a vinegar of your choice (we use homemade apple cider vinegar, but a white wine vinegar would be very good as well) leaving about an inch head space. Be sure that the raspberries are completely covered with vinegar.
Let sit in a cool, dark place about a month and taste. Ours has been sitting about 2 months and has gotten a wonderful raspberry flavor.
Use on chicken, pork, stir fries, fruit desserts and salads.