Si and Dave served up tasty beef burgers with chuck steak, bone marrow and burger sauce on The Hairy Bikers Comfort Food series.

The ingredients are: 800g chuck steak, trimmed of any gristle or hard pieces of fat, chilled, 50g bone marrow, finely diced (optional), 4 burger buns, split and flaked sea salt and freshly ground black pepper.

For the burger sauce: 100g mayonnaise, 2 tbsp tomato ketchup, squeeze of lemon juice, 1 large gherkin, finely chopped, 1 tsp garlic powder and ½ tsp chipotle paste or other hot sauce.