Frakking fantastic! Now, I made some adjustments. I didn't use any bread or milk or eggs as filler in my burger meat; I have moved away from doing that after reading Bobby Flay's burger book, and quite frankly, I think the burgers are better without all that stuff in them. I've never had a burger fall apart or crumble during cooking so I don't think it's necessary to add eggs & bread crumbs etc. I also didn't use the Asian chili sauce, and I broiled my burgers instead of frying them.
I loved these burgers so much I totally indulged and ate two! The Asian flavourings were wonderful, and I loved the crunch of the chopped chestnuts in them. I loved the bean sprout topping, too - also crunchy and tasty. As for the hoisin mayo...OMG...AMAZING! It was one incredible burger for sure, and that mayo was the cherry on the proverbial sundae.
Definitely give these a try if you're looking for a change in your same old, same old burger repertoire!