3 french bearnaise sauce Recipes

white wine vinegar, dry white wine, chopped shallot (or scallion,white part only), chopped fresh tarragon leaves (or 1 tsp. dried ), unsalted butter (1 stick), egg yolks, salt, fresh ground black pepper

good quality minced beef, french blue cheese, hamburger buns or 2 pieces french bread, halved, bearnaise sauce, dijon mustard, red onion, peeled and sliced into rings, lettuce, washed and shredded, tomato, sliced, cornichon, sliced, pepper