Put the stock, yolks of eggs and olive oil into a saucepan, stir over hot water until you have a thick, smooth sauce like mayonnaise; take from the fire, and when slightly cool stir in the tarragon vinegar and parsley. Rub the butter and flour together, add the tomato, and when boiling add a palatable seasoning of salt and pepper. Toast six halves of English muffins or squares of bread. Heat a platter, butter the toast, put it on the hot platter, and poach the eggs. Put one poached egg on each slice of toast, fill the bottom of the dish with tomato sauce and put a tablespoonful of Bernaise sauce on top of each egg. These may be garnished with a little chopped truffle, or a little chopped parsley.