Yes, you can use a slow cooker or Instant Pot to make Short Rib Ragù. Slow-Cooker: Sear the meat and sauté the vegetables in a separate pot, deglaze with the wine then add to the slow cooker with the chicken stock. Cook on low for 8 hours or 5 hours on high.  Instant Pot: Sear the meat and sauté the vegetables in a separate pot, deglaze with the wine then add to the slow cooker with the chicken stock. Choose the manual high pressure function and set it to high. Cook the short ribs for 45 minutes, followed by a 10 - 15 minute natural release.