The wurst reuben burgers Recipe | Food Network UK

Ingredients

• 30g butter
• 1 large onion, quartered lengthwise then thinly sliced
• Splash water
• 30g spicy mustard
• 500g sack sauerkraut, rinsed and drained
• 190ml sour cream
• 60ml ketchup
• 60ml pickle relish
• 750g 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
• A handful of chopped fresh flat-leaf parsley
• 30ml cider or white wine vinegar
• Salt
• freshly ground black pepper
• 15ml extra-virgin olive oil
• 4 deli slices Emmental Swiss cheese, folded to fit burgers
• 4 seeded or plain burger rolls, split
• 4 leaves red leaf or red romaine lettuce