Saucy Chicken Burger

Ingredients

• 4 burger buns
• English mustard paste as required
• Few iceberg lettuce leaves 
• 4 cheese slices  
• 2 medium tomato, cut into roundels
• Potato wedges as required
• Tomato ketchup for serving
• French fries for serving
  Chicken patty
• 400 grams chicken mince
• 1 medium onion, finely chopped
• 1 inch celery, sliced
• 1 tablespoon chopped garlic
• 1½ teaspoons dried thyme leaves
• 1½ teaspoons dried mixed herbs 
• Salt to taste 
• Crushed black peppercorns to taste 
• 1 egg
• Oil for shallow-frying
  Sauce 
• 2 tablespoons butter
• 1 tablespoon chopped garlic
• 1 inch celery, sliced
• 1 small carrot, peeled and finely chopped
• 1 small onion, finely chopped
• 2 tablespoons refined flour (maida)
• 2 cups chicken stock
• Salt to taste 
• Crushed black peppercorns to taste 
• 2 tablespoons Worcestershire sauce
• 1 tablespoon chopped fresh parsley

Method

1. To prepare chicken patties, mix together chicken mince, onion, celery, garlic, dried thyme leaves, dried mixed herbs, salt, crushed peppercorns and egg in a bowl.
2. Divide the chicken mixture into equal portions and shape into patties.
3. To prepare sauce, heat butter in a non-stick pan. Add garlic and sauté for 30 seconds. Add celery, carrot and onion and sauté for 1-2 minutes. 
4. Add flour and sauté for 1-2 minutes or till golden brown. Add chicken stock, whisk and cook till the mixture thickens. 
5. Add salt and crushed peppercorns and whisk. Add Worcestershire sauce, whisk and cook for 1 minute. Add parsley and mix well. Transfer in a bowl. 
6. Heat some oil in another non-stick pan. Place the chicken patties and shallow-fry from both sides till golden brown. Drain on absorbent paper. 
7. Halve the burger buns horizontally and roast them from the halved side on the same non-stick pan till golden brown.
8. To prepare one burger, apply some mustard paste on the toasted side of the bun halves. place 2-3 iceberg lettuce leaves, one chicken patty, 1 cheese slice, 3 tomato roundels, another chicken patty, 4-5 potato wedges on the base bun. Put some sauce, cover with the top bun with toasted side downwards and secure with a satay stick. 
9. Serve hot with tomato ketchup and French fries.