@chyna You may already know this, but for the benefit of those who don’t—in some places it is standard to use mayonaise, ranch dressing, or something similar on fries. Especially in the Benelux / “low” countries (Belgium, the Netherlands and Luxembourg).
They are next to France, and have the Friesian islands off their northern shore. If the Freisian Islands extended to neighboring coast of France, those’d be the French Friesian Islands!
So, Ketchup or vinegar with Potato Latkes, Dutch Baby potato pancakes, hash browns and tater tots—but everyone should try some white condiment such as Ranch Dressing or Mayo for fries, and siriacha or maple mustard for sweet potato fries.