Maybe they used beets that weren’t pickled enough. Or maybe it was drowned out by the bacon and fried egg. It just didn’t have enough ‘oomph’. Is it supposed to be like that?
(I did make a burger with beet at home once, only I used regular canned beats instead of pickled beets.)
(One rarely sees beets served in a restaurant. Last week I ordered a fried haddock sandwich and asked for the vegetable of the day instead of fries - imagine my surprise when she brought beets! She actually apologized and said she’d take it away and bring me applesauce if I wanted, but I said, oh, what the hell, won’t kill me!.) I could see beets on a burger, if they were pickled - we eat pickles on them sometimes, after all.
The Boston area is lousy with beets these days. The local foods renaissance means that beets, one of the things New England can produce really really well and have available cellared all winter, are becoming pretty ubiquitous in restaurants I frequent. And I love it! I love beets.
I have an Aussie friend who has been living here in the states for about 4 years now. She wasn’t quite happy with either the canned beets or the pickled beets she was trying to use on hamburgers. I had her try Harvard beets and she said those are the closest to what she had on burgers at home in Sydney. Her biggest complaint now is the beets in jars here are tiny. She likes huge slices so that only one slice is needed for a burger. I’ve only seen fresh beets that big, never in cans or jars.
I’ve never had them on burgers, so I can’t respond to that.
What I can say is that if you have leftover pickled beets, throw them on a salad. We have them on Chef’s Salads and they add so much that we don’t even bother to make 'em if we’re out of pickled beets. There’s some sort of play between pickled beets and hard-boiled eggs and cheese that is really, incredibly good. Oh, and the other veggies and lettuce are good, too.
I experienced the burger with beetroot a couple of times in New Zealand. The first time was on a somewhat large deluxe burger (from the Snack Shack in Te Anau, IIRC) with all manner of uncommon but justifiable toppings. Fried egg? Good; I’ve had that before. Slice of ham? Good idea. Pineapple ring (canned)? Well, since there’s ham, it should work. But then beetroot? On top of the egg and ham and pineapple and other sundry orthodox burger toppings? Why? It struck me as such a non-sequitur. For the record, the whole thing fell apart on me, so I couldn’t really evaluate the beet’s effect on the burger’s gastronomical alchemy.
Beetroot in a hamburger is fine. It performs the same function as a bread-and-butter pickle does in American food (though I prefer straight dills on my burgers.) A little sweetness and a little acidity to balance with the fat of the burger. I approve of beetroot on burgers.
I was trying to come up with an explanation for why, and I think that’s it. I love that bit of acidity you get from them. But it’s not quite as harsh (well harsh to me) of a full blown pickle.
(About the only place you’ll get pickles on a burger in Oz is in a Macca’s Quarter Pounder or Cheeseburger.)
That’s why I compare it to the bread & butter pickle. I find that to be particularly mild, with the acidity balanced by the sweetness. Dills are a bit sharper. But I can see what you’re saying. I think the acidity in the beetroot might be even more tempered.