Prepare the ingredients: peel and dice the mango, peel and finely chop the onion and garlic, and finely chop the tarragon.
Heat the olive oil in a medium saucepan over medium heat. Add the chopped onion and sauté for 3-4 minutes, until translucent.
Add the chopped garlic and tarragon, and cook for another minute, until fragrant.
Pour in the beer, then add the brown sugar, lemon juice, salt, and pepper. Stir well to combine.
Simmer for 5-7 minutes, allowing the sauce to slightly thicken and the flavors to meld.
Add the diced mango and cook for an additional 10 minutes, until the mango is tender but still holds its shape.
Taste the sauce and adjust the seasonings as needed, adding more sugar for sweetness or lemon juice for a tangier flavor.
Serve the sauce with grilled meats, seafood, or roasted vegetables.
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