A Caramelized Onion, Whole Grain Mustard, and Gruyere Grilled Cheese perfect for spring. Just look at that gorgeous cheese pull!!!

Today is National Grilled Cheese Day. What a glorious holiday, eh? 

A Caramelized Onion, Whole Grain Mustard, and Gruyere Grilled Cheese perfect for spring. Just look at that gorgeous cheese pull!!!

I picture National Grilled Cheese Day as a true national holiday. Marching bands playing down Main Street. Girl Scouts holding giant felt banners that say “HAVE A GOUDA DAY.” People going around with cheese stick walrus tusks in their mouth.

Moms and Dads having a homemade grilled cheese contest to see who can get the most perfect golden crisp. Dairy-free people eating soy grilled cheese and crying because they’re sad they can’t have the real stuff. And people embracing them anyways because the cheese love is so strong.

A Caramelized Onion, Whole Grain Mustard, and Gruyere Grilled Cheese perfect for spring. Just look at that gorgeous cheese pull!!!

But if I just may, I’m going to suggest something crazy. The star of the show in this grilled cheese? Well, it’s not the cheese. It’s the mustard.

Specifically, old style whole grain mustard from Maille. It takes this grilled cheese sandwich from ordinary to extraordinary. With the incorporation of Maille, this grilled cheese becomes the epitome of quality and simplicity. It pairs perfectly with the soft gruyere, and cuts the sweet caramelized onions just perfectly with its slight acidity.

A Caramelized Onion, Whole Grain Mustard, and Gruyere Grilled Cheese perfect for spring. Just look at that gorgeous cheese pull!!!

I’m going to let you in on a little secret: it’s pretty darn special.

So with National Grilled Cheese Day here, it’s time to treat yourself to something extraordinary. Say cheese!

RECIPE

Caramelized Onion, Whole Grain Mustard, and Gruyere Grilled Cheese

A Caramelized Onion, Whole Grain Mustard, and Gruyere Grilled Cheese perfect for spring. Just look at that gorgeous cheese pull!!!

Ingredients

For the caramelized onions (will make enough for 3 grilled cheeses)

  • 4 large white or yellow onions, halved and sliced into strips
  • 1/4 cup plus 1 tablespoon olive oil
  • 1/4 cup water
  • 1/4 teaspoon salt

For the grilled cheese

  • 2 slices fresh sourdough bread
  • 1 tablespoon mayonnaise
  • 2 oz gruyere cheese, grated
  • 2 tablespoons Maille Old Style Whole Grain Dijon Mustard
  • 3 tablespoons caramelized onions, from above
  • a few sprigs of fresh thyme

Instructions

Heat a heavy bottomed saucepan over medium heat. Add in onions and 1 tablespoon olive oil. Cook for 1 minute until heated through, then turn heat down to low and add in 1/4 cup water, remaining 1/4 cup olive oil, and salt.
Cook, stirring occasionally, for 1 hour. The onions will go from white to translucent, and finally will begin to turn golden brown. If the onions are looking dry, add 1-2 additional tablespoons of water, as necessary.
Once onions have reached a nice medium golden brown color, remove from heat and allow to cool slightly. Onions can be stored for up to 1 week in the fridge.
To make the grilled cheese, heat a skillet over medium heat. Spread mayonnaise over both slices of sourdough, then spread Maille Old Style Whole Grain Dijon Mustard over the opposite side of one of the slices. Place both slices, mayo side down, onto skillet.
Dollop the mustard slice of bread with caramelized onions and a sprinkle on few leaves of fresh thyme. Carefully place grated gruyere over the other slice. Cook for 2-3 minutes, until cheese is melted completely.
Press sandwich together, cut on the diagonal, and serve!

by

This post is sponsored by Maille. Thank you for continuing to support the brands who help make Broma possible!

10 comments

Reply

Mustard, caramelised onions and gruyère? YUM! Count my boyfriend and I in! Pinned for this weekend 😉

Reply

National Grilled Cheese Day? Hooray! And thank you! 🧀❤️

Reply

I am absolutely making this for lunch this weekend!

Reply

Love this dijon in this!

Reply

What a dreamy combo! That gooey cheese is everything!

Reply

Love Maille Old Style mustard. I use it in a lot of my recipes. I also love your description of the national holiday hahaha.

Reply

You took grilled cheese to a whole new level with this!

Reply

You had me at caramelized onions, these flavors are perfection!

Reply

Great way to amp up the classic grilled cheese!

Reply

wow, I’m breaking my diet for this, not too bad on the calorie count but love these flavors, thank you for this inspired grill cheese, the adult version!

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