Ultimate Burger Part 3: Truffled stuffed with bone marrow

The feedback for the marrowed hand chopped burger has been pretty good so far with only a few who obviously didn't like it too much but were ashamed to say so. How can some people not like a juicy hand-chopped burger from aged tenderloin and stuffed with bone marrow? Because they are used to eating a well-done burger. So now, I have to discriminate who to offer it to and inform them in advanced that the burger cannot (and will not) be cooked above medium. It would be pointless to cook the Chef's Burger (thats what its called in the restaurant) above medium because it will melt the bone marrow into oblivion.

The truffle sauce with the marrow in the burger was an excellent combination but when served with tomatoes, gruyere and bernaise as such in the first burger post, the flavor of the truffle gets lost. Thats the reason why the previous truffled version (see post) was not served on a bun as the mushroom sauce will make the nice bread too soggy and it can't be eaten with the hands (the proper way of eating a burger).

After eating Lusso's foie gras burger with slices of white truffle (see post), I simply got inspired again to do this version: a truffled marrow burger with caramelized onions and sauteed mushrooms with a blue cheese sauce. Cheese and truffle always work well and this combination was magical. After the second try, I believe i have come up with the final version of the ultimate burger. The first try lacked something which I could not figure out, the second try, i took out the mushrooms and used a better cheese for the sauce, a Fourme d' ambert, which was the only blue cheese I could find at Santi's. The result: Wow! The rolling of the eyes from the orgasmic mouth watering umami sensation of the combination of truffle and bone marrow and now with the blue cheese sauce happened again. I also realized the mushrooms intruded a bit with the texture of the burger, because its softness took away from the crustiness of the outer part of the pattie and it became confusing with the softness of the inner part of the medium rare cooked burger. The sweetness of the caramelized onion also played a part in the overall flavor of the burger.

Is this really the final version of the ultimate burger? I've got some foie gras in the freezer.