Instructions: Heat the oil in the cooker. Cook the leeks over medium-high heat, stirring frequently, for 1 minute. Add the wine and stir well. Continue cooking until about 25 percent of it has evaporated, 1 to 2 minutes. Add the oxtails, carrots, and olives and pour the pasta sauce on top. Sprinkle on the red pepper flakes (if using). Do not stir. Pile the potatoes on top of the sauce.

Lock the lid in place. Over high heat, bring to high pressure. Reduce the heat just enough to maintain high pressure and cook for 50 minutes. (If the oxtails are not sufficiently tender, return to high pressure for 5 or 10 minutes more.) Allow the pressure to come down naturally, 10 to 15 minutes. Remove the lid, tilting it away from you to allow excess steam to escape.

Transfer the potatoes from the cooker to a large serving platter or bowl. Pour the stew through a large strainer and degrease the sauce in a gravy separator. (Or refrigerate overnight and discard the congealed fat.) Discard any loose bones and shred the meat into bite-sized pieces.

Return the degreased sauce, meat, and potatoes to the pot and reheat. Season with salt and pepper. When ready to serve, remove the potatoes and smash them coarsely with a ricer, adding olive oil (if using) and sprinkling with Parmesan as you go. Season the potatoes with salt, if needed. Set a mound of potatoes in the center of a serving platter or individual plates and surround with the oxtail meat and sauce. Garnish with basil and an extra sprinkling of grated Parmesan.

This recipe yields 4 servings.

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