Combine the safflower oil, red wine vinegar, salt pepper, allspice and sugar into the same bowl. Pour all the mix in the blender, puree until smooth, and reserve. The vinaigrette will be textured as the vanilla bean will not let itself be entirely pureed. But that makes it even more delicious! If you will not use the vinaigrette in the next couple of hours, cover it and refrigerate. It will keep for a week, but re-emulsify or thoroughly mix, before using.