Squeeze all water out of tomatoes, then julienne cut into fine strips. It is important that all water be removed from tomatoes, and they must be added last, or dip will discolor.
Combine remaining ingredients, except tomatoes and cheese for garnish, in food processor. Blend well at low speed. Add tomatoes and slowly mix by hand for about 1 minute. When ready to serve, heat through in microwave oven. Remove from microwave and sprinkle with Asiago cheese. Put in broiler and heat until cheese browns.Makes 3 cups Source: