Peel and finely chop the onion and garlic.
In a medium saucepan, melt the butter over medium heat.
Add the onion and sauté until translucent, then add the garlic and cook for 1-2 minutes until fragrant.
Sprinkle in the curry powder and brown sugar, then cook for another minute to release the spices' aromas.
Pour in the red wine and cook over medium heat for 5 minutes to allow the alcohol to evaporate.
Add the beef broth and balsamic vinegar, then stir well to combine.
Simmer the sauce over low heat for another 10-15 minutes, or until it thickens to your desired consistency.
Season with salt and freshly ground black pepper to taste. For a smoother sauce, strain it through a fine-mesh sieve.
Serve warm with steak, roasted meats, or grilled vegetables.
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