Burger sauce. I think it’s a west coast thing. It’s just the other sauces mixed together. Mcdonalds special sauce is the same thing.
A homemade burger patty will retain more of the fat from cooking, as it wasn’t precooked and reheated, and just by looking I assume fast food burgers start out on the lean side.
I won’t compare buns and vegetables and sauces because at home burgers have neither a ceiling nor a floor in these regards. Quality can be good as you choose. I suppose the same is true of meat, but i feel like i couldn’t even buy the grade of meat from burger king if I tried.
In general, yes, a burger made at home will have more fat and thus more calories than the average fast food burger, however, I think calling this less healthy is a bit too far. You aren’t comparing plastic contamination, or the fact that a more nutritious burger (one with more fat and calories) is more delicious, and more satisfying, which may mean you eat less overall.