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1
Preheat the oven to 450.
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2
On a rimmed baking sheet, toss the tomatoes and garlic with 1 tablespoon of the oil.
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3
Season with salt and pepper and arrange cut sides down.
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4
Bake for 20 minutes, until the tomatoes are soft.
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5
Meanwhile, in a bowl, cover the chiles with boiling water and let stand for 20 minutes.
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6
Drain the chiles, reserving 2 tablespoons of the soaking liquid.
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7
Stem and seed the chiles and transfer the chiles and their reserved liquid to a blender.
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8
Peel the tomatoes and garlic, add to the blender and puree.
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9
Season the chipotle sauce with salt and pepper.
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10
In a skillet, heat 1/4 inch of oil until shimmering.
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11
Add a tortilla and fry over moderately high heat until crisp, 1 minute per side.
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12
Drain on paper towels.
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13
Repeat with the remaining tortillas.
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14
Discard the oil and wipe out the skillet.
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15
Heat the remaining 2 tablespoons of oil in the skillet.
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16
Add the diced onion and cook over moderately high heat until softened.
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17
Add the chicken livers, season with salt and pepper and cook over moderately high heat, stirring, until browned on the outside and medium within, 4 minutes.
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18
Add the chipotle sauce and bring to a simmer.
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19
Remove from the heat.
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20
Spread the tostadas with the refried beans.
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21
Spoon the livers and sauce on top.
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22
Garnish with sliced onion and cilantro and serve.