Prepare the ingredients: juice the limes, peel and finely chop the red onion and garlic.
In a medium saucepan, heat the olive oil over medium heat. Add the chopped red onion and sauté for 3-4 minutes, or until translucent.
Add the chopped garlic and curry powder, and cook for another minute until fragrant.
Pour in the tomato puree, then add the lime juice, brown sugar, apple cider vinegar, salt, and pepper.
Stir well to combine, then bring the sauce to a simmer.
Reduce the heat to low and simmer for 15-20 minutes, or until the sauce has thickened and the flavors have melded.
Taste the sauce and adjust the seasonings as needed. Add more lime juice for a tangier flavor or sugar for sweetness.
Allow the sauce to cool slightly, then blend with an immersion blender until smooth, if desired. Serve with grilled meats, roasted vegetables, or pasta.
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