Ingredients with Measurements:
- 2 tablespoons olive oil
- 2 large onions, thinly sliced
- 2 cloves garlic, minced
- 2 tablespoons balsamic vinegar
- 1 teaspoon sugar
- Salt and pepper, to taste
- 1 baguette, sliced into 1/2-inch slices
- 2 tablespoons butter, melted
- 2 cups grated Gruyere cheese
Special Equipment Needed:
- Large skillet
- Baking sheet
- Parchment paper
Step-by-Step Instructions:
1. Preheat oven to 375°F.
2. Heat oil in a large skillet over medium heat. Add onions and garlic and cook, stirring occasionally, until onions are golden brown and caramelized, about 20 minutes.
3. Add balsamic vinegar and sugar and season with salt and pepper. Cook for an additional 5 minutes.
4. Place baguette slices on a baking sheet lined with parchment paper. Brush with melted butter and top with Gruyere cheese.
5. Bake for 10 minutes, or until cheese is melted and bubbly.
6. Top with caramelized onions and serve.
Time:
Preparation Time: 10 minutes
Cooking Time: 30 minutes
Temperature: 375°F
Serving Size: 4-6
Nutritional Information (per serving):
Calories: 300
Fat: 16g
Carbohydrates: 24g
Protein: 13g
Substitutions for Ingredients
- Olive oil can be substituted with vegetable oil or butter.
- Balsamic vinegar can be substituted with red wine vinegar or apple cider vinegar.
- Gruyere cheese can be substituted with Swiss cheese or any other type of cheese.
Variations:
- Add cooked bacon or prosciutto for a meaty version.
- Add chopped fresh herbs such as thyme or rosemary for extra flavor.
- Substitute the Gruyere cheese with any other type of cheese.
Tips and Tricks:
- To ensure the onions are caramelized, make sure to cook them over low heat and stir occasionally.
- To make the crostini extra crispy, brush the baguette slices with olive oil before baking.
Storage Instructions:
Store in an airtight container in the refrigerator for up to 5 days.
Reheating Instructions:
Reheat in a 350°F oven for 5 minutes, or until heated through.
Presentation Ideas:
Serve on a platter with other appetizers or as a side dish.
Garnishes:
Garnish with fresh herbs such as thyme or rosemary.
Pairings:
Pair with a light white wine such as Sauvignon Blanc or Pinot Grigio.
Suggested Side Dishes:
Serve with a salad or roasted vegetables.
Troubleshooting Advice:
If the onions are not caramelizing, make sure to cook them over low heat and stir occasionally.
Food Safety Advice:
Refrigerate leftovers within 2 hours of cooking.
Food History:
Crostini is an Italian appetizer that originated in the 16th century.
Flavor Profiles:
This dish has a sweet and savory flavor from the caramelized onions and the nutty flavor of the Gruyere cheese.
Serving Suggestions:
Serve as an appetizer or as a side dish.
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