Somehow during my Pittsburgh upbringing I came to love hamburgers topped only by sweet pickle relish.
Later, I discovered Heinz "(red) Hamburger Relish". Wonderful stuff, but I can't find it anywhere. In fact, I don't think they make it anymore.
The last time i saw it on a grocery shelf was over 10 years ago at Giant Eagle in New Castle, PA.
After moving to Texas I discovered this FANTASTIC stuff as a solo burger topping but soon after I had become addicted to it the Texas supermarkets stopped carrying it
Presently, my solo burger topping of choice is Bennett's Chili Sauce, or if unavailable, Heinz Chili Sauce.