Peel and finely chop the red onion and garlic. Rinse the capers if you find them too salty.
In a medium saucepan, heat the olive oil and butter over medium heat.
Add the chopped onion and sauté until translucent, about 3-4 minutes.
Add the garlic and brown sugar, then sauté for another minute to meld the flavors.
Pour in the tequila and cook over medium heat for 2-3 minutes to allow the alcohol to evaporate and the aromas to develop.
Add the lime juice, capers, salt, and pepper to taste.
Simmer over low heat for another 5 minutes to allow the flavors to combine.
If you prefer a smoother sauce, use an immersion blender to purée it. If you prefer a chunkier sauce, simply stir well.
Let it rest for 5 minutes before serving to allow the flavors to meld. Serve warm or lukewarm with meats, pasta, or grilled vegetables.
It can be stored in the refrigerator in an airtight container for 4-5 days.
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