1 tsp garlic powder
1 large gherkin, finely chopped
squeeze lemon juice
2 tbsp tomato ketchup
100²µ/3Β½΄Η³ϊ mayonnaise
flaked sea salt and freshly ground black pepper
Β½ tsp chipotle paste or other hot sauce
800g/1lb 12oz chuck steak, minced
50²µ/1ΒΎ΄Η³ϊ bone marrow, finely diced