Ingredients

• 2 large yellow onions, thinly sliced
• 2 tablespoons olive oil
• 1 tablespoon unsalted butter
• 1/4 cup balsamic vinegar
• 1 teaspoon brown sugar (optional, for added sweetness)
• Salt, to taste
• Freshly ground black pepper, to taste
• Fresh thyme or parsley, for garnish (optional)

Before we proceed, do you have any specific dietary restrictions or alterations in mind for this recipe? Let me know, and I’ll tailor the instructions accordingly!