Add mustard, jam, salt, pepper, vinegar and water to a small bowl or jar. Stir well with a whisk, making sure that the jam is completely blended with the other ingredients. (See Notes if using fresh berries.)
Pour in the olive oil and whisk briskly until all the ingredients are incorporated fully.
Store in a glass jar with tight lid 3-4 weeks in the refrigerator.
Notes
*To Use Fresh Berries: Process all the ingredients at once in a blender or food processor until smooth. You may want to add a teaspoon of honey if your berries aren't very sweet.Vinegar Substitutes: Try this vinaigrette with Red or White Wine Vinegar, Rice Wine vinegar, Apple Cider Vinegar or even lemon juice if you can't have vinegar.