bun: homemade brioche
sauce: full-fat mayo
tomato: single slice of heirloom, seasoned with sea salt and pepper
onion: single slice of red, LIGHTLY sauteed in olive oil and brown sugar, seasoned with sea salt, black pepper, and celery seed
bacon: maple glazed and fried until crispy
mushroom: handful of sliced shiitake, sauteed in butter
cheese: melted danish blue
meat: ground chuck, 80/20 lean-fat ratio, seasoned with salt, pepper, and celery seed; cooked to medium rare
pickle: 3 length-wise slices of kosher dill
lettuce: 3 leaves of green leaf
sauce: special sauce

This is the burger, this is the thread.