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1
Cut the flank steak in half horizontally so it will fit into a large Dutch oven.
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2
Place it in the pot and cover it with the water.
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3
Add the six whole cloves of garlic, along with the peppercorns and salt as desired.
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4
Place over low heat and bring the liquid to a simmer.
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5
Cover the Dutch oven and continue cooking over low heat, turning the meat occasionally, until it is tender and well done, about 1 1/2 to 2 hours.
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6
While the meat is stewing, heat the broiler.
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7
Rinse and dry the peppers.
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8
Arrange them in a broiler pan about four inches from the flame.
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9
Roast them, turning frequently, until they are evenly blistered and charred on all sides.
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10
Transfer to a paper bag, seal it and let the peppers sit until cool enough to handle.
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11
Remove the cooled peppers from the bag and slice off the top of each.
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12
Scrape out the seeds and slip off the skins with your fingers (wear rubber gloves if your hands are sensitive).
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13
Slice each pepper lengthwise into strips an eighth of an inch wide.
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14
Set aside.
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15
When the meat is tender, remove the Dutch oven from the heat and let the meat cool in its own broth.
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16
When it cools enough to handle, remove it from the broth and place it on a cutting board.
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17
Slice the meat across the grain into strips about two inches across.
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18
Using your fingers, pull the meat into fine shreds.
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19
Return it to the cooking broth.
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20
Heat the lard or other fat in a large heavy skillet over medium heat until it is rippling.
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21
Crush the sliced garlic cloves and add to the hot fat.
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22
Saute for one minute, stirring frequently.
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23
Add the sliced onion and saute, stirring frequently, until it is somewhat soft, about three minutes.
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24
Add the reserved pepper strips to the pan and continue sauteing and stirring for about two minutes.
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25
Using a slotted spoon, transfer the peppers, onion and garlic to the Dutch oven.
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26
Cook the meat mixture, uncovered, over medium heat, stirring frequently, until the flavors are blended, about 10 to 15 minutes.
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27
Serve the meat hot, rolled up in heated flour tortillas.
