WHAT DOES PURE SAUCE MEAN?

It is solely an emulsification—egg yolks and butter Reduce through with vinegar flavored with tarragon and shallots, having a bite of black pepper. Think of it like a free mayonnaise, demanding only loads of whisking along with a mindful hand with the warmth to master. ... Apply the sauce to steaks or burgers, asparagus or salmon. — Sam Sifton,