Peel the onions, halve them, and slice them thinly.
Melt the butter in a skillet over medium heat, then add the sliced onions.
Sauté the onions for 5-7 minutes, until golden brown. Add the brown sugar and caramelize for another 2 minutes.
Pour in the red wine, then add the fresh thyme sprigs, ground clove, salt, and pepper.
Simmer the sauce over low heat for 15-20 minutes, until most of the wine has evaporated and the sauce has thickened.
Remove the thyme sprigs and serve the sauce warm with meats or side dishes.
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