Add the oil, vinegar, sugar, ketchup, salt, Worcestershire sauce, and onion to a quart size mason jar with a tight-fitting lid.
Shake until the sugar dissolves.
If using the dried minced onion, let sit for 1 hour before using. To rehydrate the onion. If you use fresh minced onion, you can use this right away.
Store in the refrigerator and shake well before using it.
