Caramelized Onion Grilled Cheese Sandwiches With Miso Butter

Prep Time
Cook Time
1h 19m
Ready In

Recipe: #38645

May 10, 2022

Categories: Sandwiches

"A Full flavored sandwich. Source: Umami Bomb Cookbook"

Original is 2 servings


  • Serving Size: 1 (391.3 g)
  • Calories 472.3
  • Total Fat - 19.5 g
  • Saturated Fat - 8 g
  • Cholesterol - 31.8 mg
  • Sodium - 11399.6 mg
  • Total Carbohydrate - 51.9 g
  • Dietary Fiber - 6.3 g
  • Sugars - 12.9 g
  • Protein - 23.6 g
  • Calcium - 728.9 mg
  • Iron - 3.2 mg
  • Vitamin C - 17.4 mg
  • Thiamin - 0.4 mg

Step by Step Method

Step 1

In a large skillet over medium-high heat, heat the oil until shimmering. Add the onion and salt and cook, stirring often, until the onions start to soften and brown, 5 to 6 minutes. Reduce the heat to medium-low and cook, stirring occasionally, until the onions are deeply browned and sticky, 30 to 45 minutes. Stir in the vinegar. Transfer the onions to a small bowl.

Step 2

In a small bowl, mix 1 tablespoon butter with the miso paste and mustard. Spread one side of each bread slice with the miso butter. Spread the other sides with the remaining 2 tablespoons butter.

Step 3

Return the skillet to medium-low heat. Place two of the bread slices, plain-buttered-side down, in the skillet. Divide the cheese and onions evenly between them and top with the other bread slices, plain-buttered-side up. (You want the miso butter on the inside of the sandwiches.) Cook until the bread is golden brown, 5 to 7 minutes. (Resist the urge to press the sandwich with a spatula.) Flip the sandwiches over and cook on the other side until the bread is golden brown and the cheese is melted, 5 to 7 minutes. Transfer to plates and serve with cornichons, if desired.


No special items needed.

2 Reviews


This is an excellent grilled cheese! Made this exactly as written, and next time will double the onions so we get more in every delicious bite! The miso butter is amazing on this. Thanks for sharing! Made for play in For Your Consideration at Food, Friends & Fun.


review by:
(29 Jun 2022)


What a brilliant sandwich! The mustard/miso and the vinegar in the onions was a wonderful burst of flavour! I sandwiched the onions between layers of cheese so that the onions would not slip out. DH was dunking his sandwich in your Creamy Pumpkin Soup with Coconut & Curry and he was a very happy man. Will see repeats here for sure. Thank you for sharing Nat! Made for Billboard Recipe Tag.


review by:
(1 Jun 2022)

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