Chef John's Butterless Bearnaise Sauce
This is a really quick, easy, nice sauce for steak that has no butter. Did I mention it has no butter? Just a few minutes of preparation and onto the steak it goes.
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If you want to go the extra step and put some fresh tarragon or chopped shallot in this, sure! Go ahead! If you can't get tarragon vinegar, use white wine vinegar instead.