Grilled Onion and Mushroom Sandwich Recipe

Ingredients with Measurements:
- 1 large onion, sliced
- 8 oz. mushrooms, sliced
- 2 tbsp. olive oil
- Salt and pepper, to taste
- 4 slices of bread
- 4 slices of cheese
- 2 tbsp. butter

Special equipment needed:
- Grill pan or outdoor grill

Step-by-step instructions:
1. Preheat grill pan or outdoor grill to medium-high heat.
2. In a bowl, toss sliced onions and mushrooms with olive oil, salt, and pepper.
3. Grill onions and mushrooms for 5-7 minutes or until tender and slightly charred.
4. Butter one side of each slice of bread.
5. On the non-buttered side of two slices of bread, place a slice of cheese, followed by grilled onions and mushrooms.
6. Top with another slice of cheese and the remaining slices of bread, buttered side facing out.
7. Grill sandwiches for 2-3 minutes on each side or until bread is toasted and cheese is melted.
8. Serve hot.


Time:
Preparation time: 10 minutes
Cooking time: 15 minutes
Temperature:
Grill pan or outdoor grill: medium-high heat
Serving size:
4 servings

Nutritional information:
Calories per serving: 350
Total fat: 22g
Saturated fat: 10g
Cholesterol: 45mg
Sodium: 550mg
Total carbohydrates: 26g
Dietary fiber: 3g
Sugar: 5g
Protein: 14g

Substitutions for ingredients:
- Any type of cheese can be used.
- Portobello mushrooms can be substituted for regular mushrooms.

Variations:
- Add sliced bell peppers or zucchini to the grilled onions and mushrooms.
- Use a different type of bread, such as sourdough or rye.
- Add a spread, such as mayo or mustard, to the bread before grilling.

Tips and tricks:
- Make sure to slice the onions and mushrooms evenly for even cooking.
- Use a grill pan with ridges to get those classic grill marks on the vegetables.
- Don't skimp on the butter - it helps the bread get crispy and golden brown.

Storage instructions:
This sandwich is best served fresh, but can be stored in an airtight container in the refrigerator for up to 2 days.

Reheating instructions:
To reheat, place the sandwich in a toaster oven or on a pan over medium heat until warmed through.

Presentation ideas:
Cut the sandwich in half diagonally and serve on a plate with a side of chips or a salad.

Garnishes:
Top with fresh herbs, such as parsley or basil, for added flavor and color.

Pairings:
Pair with a cold beer or a glass of white wine.

Suggested side dishes:
Chips, fries, or a side salad would make a great accompaniment to this sandwich.

Troubleshooting advice:
If the bread is burning before the cheese is melted, turn down the heat and cook for a longer time.

Food safety advice:
Make sure to cook the onions and mushrooms until tender and slightly charred to ensure they are fully cooked.

Food history:
The grilled cheese sandwich has been a popular comfort food in the United States since the 1920s.

Flavor profiles:
This sandwich is savory and slightly sweet from the grilled onions, with a rich and earthy flavor from the mushrooms.

Serving suggestions:
Serve this sandwich for lunch or dinner, or as a quick and easy snack.

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Taste: Savory, Tangy, Smoky, Earthy