Prepare the ingredients: peel and dice the mango, finely chop the red onion and garlic, and rinse the capers.
In a medium saucepan, melt the butter over medium heat. Add the chopped red onion and sauté for 3-4 minutes, until translucent.
Add the minced garlic and sauté for another minute, until fragrant.
Pour in the white wine and cook for 2-3 minutes, allowing the alcohol to evaporate.
Add the diced mango and capers, then pour in the heavy cream. Stir well to combine.
Season with salt and pepper, then add the lemon juice. Bring to a simmer, then reduce the heat to low and cook for 10-15 minutes, or until the sauce has thickened slightly.
Taste the sauce and adjust the seasoning as needed, adding more lemon juice for brightness or capers for a saltier flavor.
Let cool slightly, then serve over grilled fish, chicken, or pasta.
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