Keep warm. To make the béarnaise sauce, melt the butter in a small saucepan over a low heat. Heat the vinegar, shallots, tarragon stalks and peppercorns in a separate saucepan and cook until you ...
Equipment: You will need a cook’s blow torch. To make the béarnaise, put the shallot, peppercorns, wine and vinegar in a small saucepan. Bring to the boil and simmer until you have 1–2 ...