Finely chop the red onion and garlic.
Heat the olive oil in a medium saucepan over medium heat. Sauté the onion and garlic for 2-3 minutes, until translucent.
Add the curry powder and cook for another 30 seconds, until fragrant.
Pour in the red wine and bring to a simmer. Cook for 5 minutes to allow the alcohol to evaporate.
Add the vegetable broth, balsamic vinegar, and honey. Stir in the capers.
Simmer over medium heat for 10-15 minutes, until the sauce has thickened and the flavors have melded.
If you prefer a thicker sauce, whisk the cornstarch with cold water and pour it into the sauce. Cook for another 2-3 minutes, until it reaches the desired consistency.
Remove from heat and stir in the butter to create a silky sauce.
Taste and adjust seasoning with salt and pepper as needed before serving.
Serve warm with roasted meats, fish, or vegetables.
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