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1
Combine the salt, paprika, black pepper, cayenne, and cumin in a small bowl.
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2
Evenly rub the spice mix on all sides of the ribs; set aside.
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3
Heat the oil in a 6-quart stovetop pressure cooker over medium heat until shimmering.
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4
Working in batches, add enough short ribs to cover the bottom of the cooker without crowding them.
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5
Sear, turning occasionally, until the ribs are browned on all sides, about 6 minutes.
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6
Transfer to a large plate and repeat with the remaining ribs.
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7
Add the garlic and onion and cook, stirring occasionally, until softened, about 4 minutes.
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8
Add the cola, soy sauce, and Worcestershire and, using a wooden spoon, scrape up the browned bits from the bottom of the pressure cooker.
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9
Return the ribs to the pressure cooker, turn to coat them in the sauce, and lock the lid in place.
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10
Increase the stovetop heat to high and bring the cooker to high pressure.
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11
Reduce the stovetop heat to medium and cook for 30 minutes, adjusting the heat as necessary to maintain a visible, steady stream of escaping steam.
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12
Meanwhile, set a strainer over a large bowl; set aside.
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13
Remove the pressure cooker from the heat and allow the pressure to come down naturally for 15 minutes.
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14
Carefully quick-release any pressure left in the cooker, then remove the lid (keep your face away from the escaping steam).
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15
Transfer the ribs to a large plate and set aside.
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16
Pour the liquid through the strainer and return the contents of the strainer to the pressure cooker.
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17
Using a large spoon, skim off and discard the fat from the strained liquid and return the liquid to the pressure cooker (alternatively you can use a fat separator).
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18
Return the pressure cooker to the stove over medium-high heat and bring the mixture to a boil.
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19
Place the cornstarch and water in a small bowl, whisk to combine, and add half of the mixture to the pressure cooker.
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20
Cook, whisking constantly, until the sauce is glossy and thickened, about 30 seconds (add more cornstarch mixture as necessary if you want a thicker sauce).
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21
Remove from the heat, add the reserved ribs, and turn to coat them in the sauce.
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22
Serve immediately.