Heat 1/4 cup oil in a large saute pan over medium-high heat. Add potatoes and 2 tablespoons ginger. Cook until potatoes are browned, 7 to 10 minutes. Season with salt and pepper.
Remove from heat, and carefully add water (it will spatter). Stir in 1/4 teaspoon salt, the cayenne, cumin, and turmeric. Return to medium-high heat, and cook until potatoes are tender and water has evaporated. (If not yet tender, add more water, 1/4 cup at a time, and continue to cook.)
Stir in remaining oil and ginger, along with the mint, lime zest, salt, and pepper. Cook until mixture thickens and coats potatoes, 2 to 3 minutes. Stir in lime juice.
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