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French Onion Grilled Cheese Sandwiches

April 16, 2020 by Joy the Baker 19 Comments

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I’m here today with a humble invitation: French Onion everything.

To French an onion is to caramelize it (not technically, but you know and love the soup from whence these onions came). Caramelizing a vegetable means, in not so precise terms, that we’re using the vegetables natural sugars, heat, fat, and time to transform a usually sharp root into… basically candy.

Compelling, right? Not just compelling, it’s undeniable kitchen magic!

Can I be honest about something? This week doing things feels a touch more difficult that usual. It’s hard to describe but best I can tell, we’ve all got sandbags around our ankles and a weighted blanket over our shoulders – emotionally – ya know?

I’ve wavered this week in my desire to cook every single meal for myself.  At times like these, salted almonds and buttered popcorn is absolutely a balanced meal – no judgements.  But even still, there is meditation to be found in the kitchen when I can muster the will.

Caramelized onions are my meditative balance between effort and ease.  There’s chopping and stirring. Stirring and resting.  Stirring and daydreaming.  Stirring and staring at the wall.  Whatever you need there’s space for it with these onions and absolute reward when these onions sweeten to candy and melt inside a grilled cheese sandwich.

Pair this sop with my Creamy Tomato Soup for the ultimate dinner win.

Here’s what you’ll need:

• Two onions, peeled and sliced into thin half moons.  We’re making enough onions for two or three sandwiches (depending on your generosity) or enough for leftovers for tomorrow’s scrambled eggs.

•  Unsalted butter and olive oil to cook the onions down to delicious. Fat is always the answer. The olive oil helps keep the milk solids in the butter from scorching.

•  A few good pinches of granulated sugar to help the onions caramelize.

•  Salt and pepper for balance – the salt will also help draw the moisture out of the onions as they cook.

•  Fresh thyme for depth though dried thyme would be just fine.

•  Gruyere cheese or any kind you might prefer.  I love the nutty sharpness of gruyere.  Whole grain mustard might also be nice to coat the bread.

•  Sliced bread – whatever ya got, whatever ya like.



We’ll start by cooking down the onions since this takes some sweet time.

Heat the oil and melt the butter in a heavy bottom sauce pan over medium heat.  Add the onions and toss the to coat in fat.

Allow the onions to cook down.  This requires a balance of attention and inattention.  No need to stir too frequently, the onions need some quality time with the heat to really break down.

Add a good pinch of sugar, salt and pepper as the onions cook.  Add the thyme leaves, too.

The onions will take on a deep brown color and melt together into an almost jam.

Add a splash of beef broth or any broth really.  Water and wine are also great substitutes.

Deglaze the pan with liquid, scraping any flavorful brown bits from the bottom of the pan, coaxing the onions into jam.

Remove the onions from the hot pan and let them cool slightly while you assemble the sandwiches.



Spread several slices of bread with softened butter. Some people spread the inside of the bread with mayonnaise which you either think is a fantastic or horrific idea.

Top with grated cheese and generous spoonfuls of onions.

As with any grilled cheese, place the sandwiches in a hot pan and flip when browned.

I always burn at least one sandwich but that’s just who I am as a person – bad with toast.



Next week we’ll add a super comforting tomato soup to this sandwich situation but for now – enjoy the most delicious onions on the most simple sandwich.

Photos with Jon Melendez.

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French Onion Grilled Cheese Sandwiches

★★★★★ 5 from 1 reviews
  • Prep Time: 0 hours
  • Cook Time: 0 hours
  • Total Time: 0 hours
  • Yield: 4 persons 1x
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Ingredients

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  • 2 medium yellow onions, peeled cut in half and sliced into 1/4-inch thick semi-circles
  • 3 tablespoon unsalted butter, softened, plus more for buttering the bread
  • 1 tablespoon olive oil
  • 1 scant teaspoon kosher salt
  • 1 heaping teaspoon fresh thyme leaves
  • 1/2 teaspoon fresh cracked black pepper
  • pinch of granulated sugar
  • 3–4 tablespoons beef broth, beer, or white wine to deglaze the pan
  • 1/2 cup finely shredded Gruyere cheese, please use more cheese to your own taste
  • 4 slices bread, or more depending on how many sandwiches you’d like to make

Instructions

  1. Place a medium, heavy bottom sauce pan over medium heat. Add the butter and olive oil and stir until butter is melted. Add the sliced onions all at once. Stir to coat the onions in the fat. Allow onions to cook, undisturbed, for about 4 minutes. Add salt, thyme, and pepper and stir. Place lid on the pan and allow to onions to cook for about 4 minutes at a time. Lower the heat if the onions are browning too quickly. Remove the lid to stir the onions every so often. The onions will begin to brown, break down, and resemble an onion jam.
  2. When onions are entirely browned and completely soft, add your liquid (beef broth, beer, wine, or water) to the pan. Using a wooden spoon, scrape any burned bits off the bottom of the pan as the liquid evaporates. This takes about 30 seconds. Remove pan from heat and allow to rest while you assemble the sandwiches.
  3. Butter one side of each slice of bread. On the unbuttered side add a good sprinkling of gruyere, top with warm onion mixture, top with more cheese and the final piece of sandwich bread. Repeat process in assembling the other sandwich.
  4. Cook sandwiches over medium heat in a medium saute pan. Flip and cook until golden on the outside and melty on the inside. Place sandwich on a cutting board. Allow the sandwiches to cool for 2 to 3 minutes before slicing. Enjoy warm!

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Reader Interactions

Comments

  1. Susanne V.

    October 15, 2021 at 5:42 pm

    This is the very best grilled cheese sandwich in the Universe! Absolutely delicious! Just made these tonight and served them with a big salad.

    ★★★★★

    Reply
  2. Angela

    April 29, 2020 at 1:48 pm

    You’re a genius. This was unspeakably delicious.

    Reply
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