Wash cauliflower and cut into 1 inch pieces. Cut tomato into 1/2 inch square pieces.
In a large pot, boil 6 cups of water, adding 1 teaspoon of salt. Put cauliflower in for 6 minutes, drain.
In a large pan, heat 2 tablespoons cooking oil. Add tomato pieces, seasoned with salt and pepper, cook until tomato is tender (about 1 minute).
Add cauliflower, chicken broth; mix well. Simmer for 5 minutes. Mix milk, corn starch and sugar. Add to the cauliflower, tomato as sauce, simmer for 5 minutes.