Rump Steak Burger & Bone Marrow Recipe - Great British Chefs

Ingredients

• 400g of rump steak, trimmed of any excess fat and sinew
• 25g of butter
• 1 onion, finely chopped
• 1 tbsp of marjoram leaves
• 2 tbsp of black peppercorns
• 125g of bone marrow, wrapped and frozen
• 4 burger buns
• 4 dollops of mayonnaise
• 1 dash of vegetable oil
• 1 dash of olive oil
• salt to season
• pepper to season