Be'Arnaise Sauce (France) - cooking recipe

Ingredients

1/2 tsp. coarse black pepper
4 Tbsp. white wine vinegar
1/2 c. beef stock
1/2 Tbsp. whole tarragon leaves
1/4 c. chopped onion
1/2 c. dry red wine

Preparation

Here we are preparing a reduced Bearnaise Sauce that is stirred into Hollandaise Sauce.
Can be prepared days ahead and refrigerated.