Sweet Onion Reuben Sandwich

Ingredients

• 1/2 pound Ground Beef (80% lean or leaner), shaped into patty
• 1/2 cup drained sauerkraut
• 1/2 cup bread and butter pickle slices, drained
• 1/2 cup arugula
• 2 tsp salt, divided
• 2 tsp ground black pepper, divided
• 1/2 cup mayonnaise
• 2 tablespoons ketchup
• 1 tablespoon sweet pickle relish
• 1 teaspoon Worcestershire sauce
• 1 teaspoon red wine vinegar
• 1 teaspoon Dijon mustard
• 1 tablespoon finely chopped fresh dill
• 1 tablespoon vegetable oil
• 1/4 cup thinly sliced sweet yellow onion
• 3 slices Swiss cheese
• 2 slices swirl rye bread
• 1 tablespoon olive oil, for toasting bread