Place the tomatoes, basil,red wine vinegar, balsamic vinegar , Dijon Mustard, garlic and a half cup olive oil into a blender or food processor. Blend about 2-3 minutes. With the machine still running, add the remaining half cup olive oil and process until well blended. Salt and pepper to your liking. Cover and refrigerate until ready to use. Can be made up to a day ahead of using.