Tarragon Sauce - cooking recipe

Ingredients

4 tablespoons unsalted butter, room temperature
1 shallot, chopped
1/4 cup dry white wine
1/3 cup tarragon leaf
2 -4 tablespoons parsley sprigs, chopped
lemon juice, fresh
salt
pepper

Preparation

Melt 1 T butter over medium heat. Add shallots and cook until soft but not brown (less than 1 minute).
Add wine and gently boil uncovered until all of liquid is evaporated and shallots make a sizzle noise.
Mix 1/4 cup of poaching liquid or chicken broth to onions. DO NOT ADD MORE - it will be too thin.
When liquid simmers over medium heat whisk in 1 T butter at a time. Wait until the previous on e almost melts before adding another.
Add lemon juice and salt continuing to whisk. Turn off heat.
Add tarragon and parsley and onion mix to blender. Process until smooth.