Start by adding cornstarch and water to a high-powered blender.
Blend the mixture until it becomes completely smooth. This step helps prevent lumps during cooking.
Pour the blended mixture into a 3.5-quart saucepan.
Place the saucepan on the stove over medium-high heat.
Start heating the mixture while stirring constantly with a whisk or spoon.
Continuous stirring prevents the cornstarch from sticking to the bottom of the pan.
Once the mixture begins warming, add the following ingredients:
Chinkiang vinegar
Butter or margarine
Onion powder
Sugar
Salt
Celery seed
Celery salt
Black pepper
Stir thoroughly after adding each ingredient to ensure everything blends smoothly.
Continue cooking the mixture while stirring constantly.
After a few minutes, the dressing will begin to thicken and become smooth.
This process usually takes about 15 to 20 minutes.
Once the dressing reaches a smooth, thick consistency, remove the saucepan from the heat.
Allow the dressing to cool completely.
After the dressing has cooled, pour it into an airtight container or jar.
Seal the container tightly and store it in the refrigerator.
Your Bob Evans Colonial Salad Dressing is now ready to use.