It varies, depending on the french fry type.
Vinegar.
Salt.
Heinz Ketchup. (not all ketchup's are created equal however)
Sweet & sour sauce. (only at McD)
BBQ.
My weirdest one, I will sometimes order a McD's hot fudge sundae and dip salted McD fries into it.
Vinegar.
Salt.
Heinz Ketchup. (not all ketchup's are created equal however)
Sweet & sour sauce. (only at McD)
BBQ.
My weirdest one, I will sometimes order a McD's hot fudge sundae and dip salted McD fries into it.