Aunt Rosie s BBQ Sauce

1 cup ketchup

½ cup brown sugar

½ cup water

1 (1 ounce) package dry onion soup mix (such as Lipton®)

Stir ketchup, brown sugar, water, and dry onion soup mix together in a saucepan; bring to a boil, stirring regularly, until sugar is dissolved, about 5 minutes.