Ingredients with Measurements:
- 1 sheet of puff pastry, thawed
- 2 large onions, thinly sliced
- 2 tablespoons of butter
- 1 tablespoon of olive oil
- 1 teaspoon of salt
- 1/2 teaspoon of black pepper
- 1/4 cup of white wine
- 1 cup of grated Gruyere cheese
- 1 egg, beaten
Special equipment needed:
- Baking sheet
- Parchment paper
- Rolling pin
- Pastry brush
Step-by-step instructions:
1. Preheat the oven to 400°F (200°C).
2. In a large skillet, melt the butter and olive oil over medium heat. Add the sliced onions, salt, and black pepper. Cook for 20-25 minutes, stirring occasionally, until the onions are caramelized and golden brown.
3. Add the white wine to the skillet and cook for an additional 5 minutes, until the liquid has evaporated. Remove from heat and let cool.
4. On a lightly floured surface, roll out the puff pastry into a large rectangle. Transfer the pastry to a baking sheet lined with parchment paper.
5. Spread the caramelized onions evenly over the puff pastry, leaving a 1-inch border around the edges.
6. Sprinkle the grated Gruyere cheese over the onions.
7. Brush the edges of the puff pastry with the beaten egg.
8. Bake for 20-25 minutes, until the pastry is golden brown and the cheese is melted and bubbly.
9. Let the quadro cool for a few minutes before slicing into squares.
Time:
Preparation time: 15 minutes
Cooking time: 50 minutes
Temperature:
400°F (200°C)
Serving size:
6-8 servings
Nutritional information:
Calories per serving: 320
Fat: 22g
Carbohydrates: 22g
Protein: 8g
Sodium: 540mg
Sugar: 3g
Substitutions for ingredients:
- Puff pastry can be substituted with phyllo dough or pie crust.
- Gruyere cheese can be substituted with Swiss cheese or cheddar cheese.
Variations:
- Add chopped bacon or prosciutto to the caramelized onions for a meaty twist.
- Top the quadro with fresh herbs like thyme or rosemary before baking.
- Substitute the onions with sliced mushrooms for a vegetarian option.
Tips and tricks:
- Make sure to slice the onions thinly and cook them slowly over low heat to achieve the perfect caramelization.
- Use a sharp knife or pizza cutter to slice the quadro into squares.
- Serve the quadro warm or at room temperature.
Storage instructions:
- Store any leftover quadro in an airtight container in the refrigerator for up to 3 days.
Reheating instructions:
- To reheat, place the quadro on a baking sheet and bake in a preheated oven at 350°F (180°C) for 10-15 minutes, until heated through.
Presentation ideas:
- Serve the quadro on a wooden board or platter.
- Garnish with fresh herbs or a sprinkle of paprika.
Pairings:
- Serve with a crisp green salad or roasted vegetables.
Suggested side dishes:
- Roasted asparagus
- Garlic mashed potatoes
- Grilled zucchini
Troubleshooting advice:
- If the puff pastry becomes too soft or sticky, place it in the refrigerator for a few minutes before continuing with the recipe.
- If the quadro becomes too brown on the edges, cover it with foil during the last few minutes of baking.
Food safety advice:
- Make sure to cook the onions thoroughly to avoid any risk of foodborne illness.
- Store any leftovers in the refrigerator and consume within 3 days.
Food history:
- Caramelized onions have been used in French cuisine for centuries, and are a staple ingredient in dishes like French onion soup and quiche Lorraine.
Flavor profiles:
- The quadro has a rich and savory flavor, with the sweetness of the caramelized onions balancing out the sharpness of the Gruyere cheese.
Serving suggestions:
- Serve the quadro as an appetizer or as a main course with a side salad or vegetables.
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