Heat sous vide bath to 128 degrees for medium rare, 135 for medium

Season steak on both sides with salt and pepper

Add steak to airtight seal-able bag

Add rosemary, thyme and 2 tablespoons butter

Seal bag and place in sous vide bath

Cook for 1-4 hours

Heat grill, broiler or stovetop to high

Remove meat from water bath and bag

Cook on grill or stovetop for two minuter per side

Let rest for 5 to 10 minutes topping with remaining butter, if desired