I grew up eating this, I never had the kind out of the jar until I went to a friend's house and it was sooo gross tasting to me!!
I can't even eat the ones at restaurants! This is the only one for me! Recipe can easily be doubled.
Mix all ingredients together in a small bowl. Taste. If it tastes off (I say this cause I dont really measure, just put things in till they taste good) then may need to add a touch more lemon or wostershire. If you like really spicy, a little bit more horseradish. If too watery looking may need to add some more ketchup.