Mix 200ml olive oil and 150ml ketchup together. Add 2tbsp chopped shallots, 1tbsp chopped tarragon, 1tbsp chopped chives, 1tbsp chopped chervil, 1tbsp Worcestershire sauce and around ten drops of Tabasco®, or to taste. Mix everything together. I’ve suggested chervil and tarragon for this recipe but if you can’t get chervil use parsley. If you can’t get tarragon, use basil. It’s your choice.