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Preheat oven to 325 degrees with a rack set in the center of the oven. Line a baking sheet with parchment paper and set aside.
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In a medium bowl, combine oil, soy sauce, garlic, ginger, fish sauce, and sugar; set aside.
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Spread nuts in a single layer on prepared baking sheet and bake until fragrant and just beginning to brown, about 15 minutes.
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Remove peanuts from oven and stir into ginger-garlic mixture to coat. Return coated nuts to baking sheet and transfer to oven; bake until peanuts are light golden brown, 10 to 15 minutes. Remove from oven and season with salt and pepper. Let cool before serving.