Caramelized Onion Bustrengo Recipe

Ingredients with Measurements:
- 2 large onions, sliced
- 2 tablespoons olive oil
- 2 tablespoons butter
- 2 tablespoons brown sugar
- 2 tablespoons balsamic vinegar
- 1 teaspoon salt
- 1 teaspoon freshly ground black pepper

Special Equipment Needed:
- Large skillet
- Wooden spoon

Step-by-Step Instructions:
1. Heat the olive oil and butter in a large skillet over medium heat.
2. Add the onions and cook, stirring occasionally, until they are softened and lightly golden, about 10 minutes.
3. Add the brown sugar, balsamic vinegar, salt, and pepper.
4. Continue to cook, stirring occasionally, until the onions are golden brown and caramelized, about 10 minutes more.

Time:
Preparation Time: 10 minutes
Cooking Time: 20 minutes
Temperature: Medium heat
Serving Size: 4 servings

Nutritional Information:
Calories: 140
Fat: 8g
Carbohydrates: 16g
Protein: 1g

Substitutions for Ingredients
- Olive oil can be substituted with vegetable oil.
- Butter can be substituted with margarine.
- Brown sugar can be substituted with white sugar.
- Balsamic vinegar can be substituted with red wine vinegar.

Variations:
- Add 1 teaspoon of dried thyme or rosemary for additional flavor.
- Add 1/4 cup of chopped fresh parsley for a pop of color.

Tips and Tricks:
- Make sure to stir the onions occasionally to prevent them from burning.
- If the onions start to stick to the pan, add a tablespoon of water to help loosen them.

Storage Instructions:
Caramelized onions can be stored in an airtight container in the refrigerator for up to 5 days.

Reheating Instructions:
Reheat the onions in a skillet over medium heat until warmed through.

Presentation Ideas:
Serve the caramelized onions over toast, in tacos, or as a topping for burgers.

Garnishes:
Garnish with fresh parsley or chopped chives.

Pairings:
Pair with a crisp white wine or a light beer.

Suggested Side Dishes:
Serve with roasted vegetables, a green salad, or mashed potatoes.

Troubleshooting Advice:
If the onions start to burn, reduce the heat and add a tablespoon of water to the pan.

Food Safety Advice:
Make sure to store the onions in an airtight container in the refrigerator and use within 5 days.

Food History:
Caramelized onions have been a popular dish in many cultures for centuries.

Flavor Profiles:
Caramelized onions have a sweet and savory flavor with a hint of acidity from the balsamic vinegar.

Serving Suggestions:
Serve the caramelized onions as a side dish or as a topping for burgers, sandwiches, or pizza.

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Region: Spanish

Taste: Savory, Sweet, Caramelized, Oniony, Rich, Tangy