Hot Onion Open Faced Sandwich
Indulge in the irresistible flavors of a Hot Onion Open-Faced Sandwich, where sweet, caramelized yellow onions meet a golden layer of melted Gruyère cheese atop crispy slices of artisanal bread. This easy yet sophisticated recipe combines the richness of butter and olive oil with a tangy touch of balsamic vinegar to elevate the onions to perfection. Finished with fresh thyme for a fragrant flair, this sandwich is broiled to achieve bubbling, gooey cheese that contrasts beautifully with the crusty toast. Ready in just 35 minutes, it's perfect for a quick lunch, an elegant appetizer, or a comforting snack. Your taste buds will thank you for every bite of this savory masterpiece!
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Recipe Information
Ingredients
- 2 large Yellow onions
- 2 tablespoons Butter
- 1 tablespoon Olive oil
- 0.5 teaspoon Salt
- 0.25 teaspoon Ground black pepper
- 1 teaspoon Balsamic vinegar
- 4 slices Thick slices of crusty bread (e.g., sourdough, ciabatta)
- 1 cup Gruyère cheese (or any melty cheese of choice)
- 1 teaspoon Fresh thyme (optional)
Instructions
Peel and thinly slice the yellow onions into even strips.
In a large skillet, heat the butter and olive oil over medium heat until melted and shimmering.
Add the sliced onions to the skillet and toss to coat them in the butter and oil mixture.
Sprinkle the salt and ground black pepper over the onions, and stir gently.
Cook the onions on medium-low heat, stirring occasionally, for about 15-20 minutes or until they are soft, golden brown, and caramelized. Reduce the heat if they start to stick or brown too quickly.
Once caramelized, stir in the balsamic vinegar and cook for 1 more minute, allowing the vinegar to coat the onions. Remove from heat and set aside.
Preheat your oven to broil (high setting) and position the rack about 6 inches from the heat source.
Place the bread slices on a baking sheet and broil for 1-2 minutes per side, or until lightly toasted. Keep a close eye to avoid burning.
Spread an even layer of the caramelized onions onto each toasted bread slice.
Sprinkle the grated Gruyère cheese generously over the onions on each slice.
Return the baking sheet to the oven and broil for 2-3 minutes, or until the cheese is melted, bubbly, and lightly golden.
Remove the sandwiches from the oven and sprinkle with fresh thyme if desired.
Serve hot and enjoy!
Nutrition Facts
Calories |
1979 | ||
|---|---|---|---|
% Daily Value* |
|||
| Total Fat | 120.3 g | 154% | |
| Saturated Fat | 61.3 g | 306% | |
| Polyunsaturated Fat | 2.0 g | ||
| Cholesterol | 279 mg | 93% | |
| Sodium | 4282 mg | 186% | |
| Total Carbohydrate | 128.7 g | 47% | |
| Dietary Fiber | 10.8 g | 39% | |
| Total Sugars | 24.7 g | ||
| Protein | 93.4 g | 187% | |
| Vitamin D | 0.5 mcg | 2% | |
| Calcium | 2694 mg | 207% | |
| Iron | 8.6 mg | 48% | |
| Potassium | 889 mg | 19% | |
*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
