Grilled Flank Steak Sandwich with Sweet Onion Marmalade and Pear Horseradish Mustard

July 19th, 2011

This has got to be one of the best sandwiches I have ever made.  It may become my signature sandwich, if there is such a thing.  It all started when I was contemplating entering a contest at one of my new favorite  websites, Food52.  The contest this week is “Your best flank steak”.  I was looking to do a little something different than just grill a marinated flank steak, but decided that could be my jumping off point.  I love onions and have been making a red onion marmalade to accompany my pork tenderloin for years.  For the sandwich I decided to do sliced sweet Vidalia onions and cooked them with sugar and vinegar to give them a sweet and sour taste.  In an old Gourmet magazine there was a recipe for a pear and horseradish mustard that has always intrigued me.  I fiddled with the recipe, changed some of the ingredients and finally got a condiment that is way better than either mustard or mayonnaise.  It has a little kick from the horseradish and sweetness from the pears, steeped in cinnamon, bay and peppercorns.  Wow!

With ingredients this good, I needed a bread that would compliment the flavors but not overpower them.  I love ciabatta rolls.  They have a great texture and a mild taste.  I browned the split ciabatta rolls in a little olive oil in a large skillet and they had a nice crunch to them.  They were just perfect for the melting steak slices and sauteed onions.  But the star of this show is the pear horseradish mustard.  It makes a lot and keeps in the refrigerator for up to a month.  So you can enjoy it on many different sandwiches.  As for me, I think I will be grilling a lot of flank steaks.

Comments on the entries in the contest are important.  I would appreciate it if you would comment on my entry.  Just go to Food52 and tell me what you think.  Thank you!


Serves 4

For the Flank Steak and Sweet Onion Marmalade:

1 Flank Steak, 1 1/2 to 2 lbs
5 tablespoons Worcestershire sauce
5 tablespoons Ketchup
5 teaspoons Brown sugar
1/2 cup Red Wine

2 Large Vidalia onions, halved and sliced
3 tablespoons Canola oil
3 tablespoons Sugar
3 tablespoons Red Wine Vinegar
1/4 cup Water

1.Marinate the flank steak in the Worcestershire, ketchup, brown sugar and red wine in the refrigerator for at least 2 hours or overnight. 

2.While steak is marinating, heat the 3 tablespoons of oil in a large skillet. Add the sliced onions and cook over moderate heat until the onions become soft. Add the sugar and cook stirring for a few minutes. Add the vinegar and turn the heat to low and cook until almost all of the liquid has evaporated. Add the water and simmer, stirring, until mixture is slightly thickened and onions are very tender, about 10 minutes. 

3.Prepare grill. Remove steak from marinade and grill it over hot coals turning once until it reaches your desired doneness. Medium rare to medium works best. Remove steak and let rest before slicing it into thin strips. 

For the Pear Horseradish Mustard and Final Assembly:

4 Ripe Pears, peeled and chopped
1/2 cinnamon stick
1 bay leaf
6 peppercorns
1/4 cup Red Wine Vinegar
1/2 cup Red Wine
1 10 ounce bottle of Grey Poupon Dijon Mustard
2 tablespoons Creamy Horseradish
4 Ciabatta rolls, split and cut side browned in an oiled pan
Chopped lettuce for garnish

1.Wrap the cinnamon stick, bay leaf and peppercorns in a small piece of cheesecloth and tie with kitchen string. Add the chopped pears and cheesecloth bag to a large saucepan with the red wine vinegar and wine. Bring the mixture to a boil and reduce heat to simmer. Cook uncovered for about 20 minutes or until the liquid has reduced. Cool slightly and remove cheesecloth bag. Puree the mixture in a food processor. Add the pear puree to a large bowl along with the Dijon mustard and the horseradish. Stir to combine. The pear horseradish mustard keeps, covered and chilled for 1 month. 

2.Assemble the sandwiches. Spread the split and toasted ciabatta rolls with 1 tablespoon pear horseradish mustard per side (or to taste). Add the sliced steak and the onion marmalade. Garnish with lettuce. Enjoy
Printable recipe

10 responses to “Grilled Flank Steak Sandwich with Sweet Onion Marmalade and Pear Horseradish Mustard”

  1. I’m intrigued with the pear horseradish mustard too Penny. It sounds divine. I see nothing wrong with having a signature sandwich when one’s as big a hit as this one is.

    Bonne chance as the French would say and good luck in the contest. I’m off to comment now…

  2. Rita says:

    Aamzing! I have never prepared flank steak. I am looking for a summer creation for next week when my son and family (2 teens)are coming for a few days. Superb recipe; Merci. Going to cast my vote.

  3. That sounds great Penny. I just went over to the site and left a comment, as well as “like” on facebook.

  4. Lyla says:

    I can tell you right now that this will be a Bill Fox favorite. I can’t wait to make it for him. And I, too, love ciabatta rolls. We’re having company soon, and this is just the kind of sandwich I’ve been searching for. Thanks.

  5. Haden News says:

    The flavors in this sandwich sound so good! Can’t wait to give it a try.

    Good luck with the contest – I am leaving here to go vote 🙂

  6. Barbara says:

    Good for you, Penny. I like Food 52 too. You’ve picked a great recipe to feature in their latest contest. I’ll go on over and comment!

  7. Big Dude says:

    Looks like a super sammie from here Penny.

  8. I see you posted… hooray!!!

    And mark me down for one of these… heading over to vote for you in your contest… good luck!

  9. Cathy says:

    I love, love, love a good sandwich and this one looks fantastic, Penny. Your sweet onion marmalade would be delicious with flank steak and I know I would love it on a burger as well. I’m on my way over to Food52.

  10. Pear Horseradish Mustard? Do you know how impressed my friends would be if I served them that? Plus flank steak… and ciabatta. That is my kind of sandwich! I love the way you make! – Gary

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