Cheddar-Stuffed Burgers

Ingredients

• as needed Salt and Pepper
• 1 Cabbage
• 1 cup White vinegar
• 1 tbsp. Light brown sugar
• 2 tbsp. Mustard seeds
• as needed Vegetable oil
• 5 large Shallots
• 1/4 cup All-Purpose flour
• 1 1/2 lb. Ground beef chuck
• 1 tsp. Onion powder
• 1 tsp. Garlic powder
• 1 tsp. Sweet smoked paprika
• 1 tbsp. Worcestershire sauce
• 6 oz. Cheddar cheese
• 2 cups Baby arugula
• 4 Hamburger buns