Sous Vide Flat Iron Steak

This easy sous vide flat Iron Steak is cooked medium-rare and is so tender and full of flavor. Choose your favorite store-brand of beef seasoning rub or do a custom seasoning according to your taste preference.


  • 1-½ to 2 pounds flat iron steak
  • 2-3 tablespoons dry beef rub

To Sear the Steak

  • high smoke point oil such as safflower or refined avocado oil
  • 1 tablespoon butter


Prepare the sous vide system:

  1. Fill the sous vide water container with water, attach the heating unit, and set it to your desired temperature.  We set our unit to 130°F for medium-rare. You should choose the temperature that you like your steak cooked to.

Prepare the Steak:

  1. Pat the steak dry with a paper towel.
  2. Coat the flat iron on both sides with the rub, rubbing it into the surface.  (we used our Santa Maria Rub)
  3. Transfer the steak to the refrigerator for one hour so the rub can penetrate into the steak. (this is an optional step).
  4. Place the flat iron steak in a vacuum-seal bag and seal, removing the air. Optionally, submerge a ziplock bag in water (without submerging the opening) and let the water push all the air out, then seal the bag.

To Cook the Steak:

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