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1
Prepare a grill or grill pan to medium-high heat.
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2
Sprinkle the chicken, flank steak and shrimp with salt and pepper.
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3
Grill the chicken until cooked through, about 6 minutes per side.
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4
Transfer the chicken to a platter and cover with aluminum foil to keep warm.
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5
Grill the flank steak to the desired doneness, about 5 minutes per side for medium.
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6
Add it to the platter with the chicken.
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7
Grill the shrimp until just cooked through, about 3 minutes per side.
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8
Add them to the platter.
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9
Grill the scallions until brown, about 3 minutes per side.
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10
Add them to the platter.
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11
Heat 2 tablespoons of the oil in a large, heavy saucepan over medium-high heat.
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12
Add the tomatoes, garlic and onions.
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13
Cook until the onions are golden, about 8 minutes.
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14
Add the oregano, cumin, bouillon, sugar and chiles.
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15
Stir until fragrant, about 2 minutes.
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16
Add 1 cup water to the saucepan and bring to a boil.
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17
Reduce the heat to medium low and simmer until the chiles are soft, 2 minutes.
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18
Let the mixture cool slightly.
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19
Transfer the mixture to a blender, add 1 cup water and blend until smooth.
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20
Strain the sauce into a medium bowl.
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21
Heat the remaining 1 tablespoon oil in the same saucepan over medium heat.
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22
Return the sauce to the pan and simmer until slightly thickened, about 2 minutes.
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23
Season the sauce with salt and pepper.
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24
Preheat the oven to 350 degrees F.
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25
Place 2 molcajetes (see Cook's Note) in the oven and heat them for 10 minutes (or use 2 small to medium cast-iron skillets).
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26
Using oven mitts, remove them from the oven and carefully transfer them to a heatproof surface (be careful, as the molcajetes get extremely hot).
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27
Bring the sauce to a boil.
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28
Cut the chicken and flank steak into 3/4-inch-wide strips.
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29
Arrange the chicken and steak strips, shrimp, scallions and cheese slices around the edges of the heated molcajetes.
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30
Pour the boiling sauce into the center.
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31
Serve very hot, with tortillas to make tacos.