Gather all your ingredients on the counter. Having everything ready will streamline the process.
In your blender or food processor, combine the egg, ketchup, white vinegar, sugar, salt, and paprika. Blend until smooth.
With the blender running, slowly drizzle in the salad oil and continue blending until thick and well combined.
Taste the dressing and adjust seasoning as needed, adding more sugar or vinegar to suit your taste.
Transfer the dressing into an airtight container and let it chill in the refrigerator for a few hours for best flavor.
