Caramelized Onion and Spinach Grilled Cheese

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Caramelized Onion and Spinach Grilled Cheese

A recipe for Caramelized Onion and Spinach Grilled Cheese! This sandwich is packed with caramelized onions, sautéed spinach, and melted cheese for a delicious and comforting lunch.

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Ingredients

Servings
  • 2 tablespoons butter plus more for spreading over the bread, unsalted, 28 grams
  • 1 tablespoon olive oil 15 milliliters
  • 2 onion peeled and thinly sliced, medium
  • 2 cloves garlic peeled and minced
  • 1 tablespoon balsamic vinegar 15 milliliters
  • salt to taste, freshly ground
  • black pepper to taste, freshly ground
  • 3 ounces spinach baby leaves, 85 grams
  • 8 lices sourdough bread or rustic bread
  • 1/4 cup Dijon mustard 60 grams
  • 8 lices swiss cheese or 16 slices if small, or Cheddar, Fontina, Mozzarella cheese
  • 1/4 cup mayonnaise 60 grams

Instructions

  1. In a large pan, place the butter and olive oil over medium low heat.
  2. Once the butter is melted, add the onions and cook, stirring occasionally, until deeply golden and caramelized. Adjust heat between medium and low as needed to caramelize the onions without burning.
  3. Add the garlic and cook just until fragrant, 30 seconds to 1 minute.
  4. Stir in the balsamic vinegar and season with a large pinch of salt and pepper.
  5. Stir in the baby spinach and continue to cook until the leaves are wilted and any released moisture evaporates.
  6. Remove from heat and set aside to cool slightly.
  7. Place two slices of bread on a work surface.
  8. Brush the outside of each slice of bread with a thin layer of butter.
  9. Place the slices butter-side down on the work surface.
  10. On the inside of one slice of bread, spread a thin layer of mustard.
  11. Cover the mustard with a slice of cheese (or two if the slices are small).
  12. Cover the slice of cheese with a thin layer of the caramelized onion spinach mixture.
  13. Cover with another slice (or two) of cheese.
  14. Spread a thin layer of mayonnaise on the inside of the other slice of bread.
  15. Place the slice of bread, mayonnaise-side down, over the cheese to complete the sandwich.
  16. Repeat with the remaining slices of bread and ingredients to make four sandwiches in all.
  17. Place a skillet over medium-low heat.
  18. Gently transfer the assembled sandwich to the hot skillet. Cook, adjusting the heat between medium-low and low as needed, until the bread is golden and the cheese has melted, about 2 minutes per side.
  19. Repeat with the remaining sandwiches.
  20. Serve the Caramelized Onion and Spinach Grilled Cheese while still hot.
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