The Wurst Reuben Burgers

Deselect All

2 tablespoons butter

1 large onion, quartered lengthwise then thinly sliced

Splash water

2 tablespoons spicy mustard

1 pound sack sauerkraut, rinsed and drained

3/4 cup sour cream

1/4 cup ketchup

1/4 cup pickle relish

1 1/2 pounds ground pork or ground pork and veal combined

1 teaspoon dried marjoram

1 teaspoon ground ginger

1/2 teaspoon freshly grated nutmeg

1 teaspoon celery seeds

1/2 teaspoon ground cardamom

1/4 cup finely chopped fresh flat-leaf parsley

2 tablespoons cider or white wine vinegar

Kosher salt and freshly ground black pepper

1 tablespoon extra-virgin olive oil

4 deli slices Emmentaler Swiss cheese, folded to fit burgers

4 seeded or plain burger rolls, split

4 leaves red leaf or red romaine lettuce