Salmon burgers with mozzarella and asparagus - Serving Dumplings

Ingredients

• 10 ounces skinless salmon fillets
• 1 tbsp chopped chives
• 1 tbsp chopped dill
• ½ mozzarella ball
• salt (to taste)
• black pepper (to taste)
• ½ cup breadcrumbs
• vegetable oil (for frying)
• 3 tbsp mayonnaise
• 1 tbsp Dijon mustard
• 1 tsp pickled cucumber (diced)
• 1 shallot (diced)
• 1 garlic clove (grated)
• 1 tbsp capers
• 1 tsp lemon juice
• 1 tbsp chives (chopped)
• 2 buns
• ½ mozzarella ball (sliced)
• 3.5 ounces asparagus
• 1 tbsp unsalted butter