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1
For the croquettes: Put the potatoes in a heavy medium pot and cover with cold water.
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2
Stir in the salt and bring to a boil over high heat.
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3
Reduce the heat to medium and simmer until very tender, about 30 minutes.
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4
While the potatoes simmer, heat 1 tablespoon of olive oil in heavy large skillet over medium heat.
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5
Add the onions and cook until softened, about 4 minutes.
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6
Add the garlic and cook until fragrant, about 2 minutes.
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7
Add the achiote paste or smoked paprika, if using, mix well until combined, and remove from the heat.
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8
Set aside.
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9
Drain the potatoes, cool until able to handle, and peel.
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10
Mash them in a large bowl with a fork or potato masher.
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11
Add the mozzarella cheese and onion mixture and stir to combine.
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12
Season with salt and pepper, to taste.
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13
Divide the mixture into 8 balls and flatten them into 3-inch patties.
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14
Heat 2 tablespoons olive oil in a 12-inch nonstick skillet over medium-heat until hot.
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15
Fry the croquettes in 2 batches, turning over once, until a crust forms.
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16
Drain on paper towels.
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17
Carefully transfer the croquettes to a platter.
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18
Top with the arugula and drizzle with the remaining 1 tablespoon olive oil.
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19
Squeeze lime juice on top and sprinkle with salt and pepper.