1. Wash tomatoes and slice in half. Place the tomatoes on a lightly oiled wire line sheet pan into a 400 degree oven and roast for 25 minutes until the outer skin of the tomato is light charred.
2. Allow to cool completely.
3. Place all dressing ingredients except for the oil in a blender. Start on the lowest speed setting and increase gradually to the highest setting.
4. Slowly add the oil in a fine, steady stream.