Chop up one shallot exceedingly fine, with half a tablespoonful of chervil, and the same of tarragon, and twelve capers chopped exceedingly fine. Place these in an earthen bowl with half a teaspoonful of ground English mustard, two raw egg yolks, a tea-spoonful of vinegar (a small drop at a time), half a pinch of salt, and a third of a pinch of pepper. Pour in very lightly, while continuing to stir, a cupful of good olive oil, and if too thick, add a little more vinegar. Taste it to find whether the seasoning is correct ; if too salt, add a little more mustard and oil.