Mix the butter, lime zest, mint, chile powder, garlic and 1/2 teaspoon salt in a medium bowl with a rubber spatula until well blended. Serve at room temperature or transfer the butter to a piece of plastic wrap, wax paper or parchment and roll it up, twisting the ends to make a tight log. Keep in the refrigerator for up to a week or in the freezer for 2 months.
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