Salt and pepper the ribs, then dredge in flour. Set aside
In a large cast iron skillet , cook the pancetta or bacon over medium heat until completely crispy and all the fat is rendered. Remove the pancetta and set aside. Do not discard the grease.
Add the olive oil to the pan with the pancetta or bacon grease, and raise the heat to high. Brown the ribs on all sides, about 45 seconds per side. Remove the ribs and set in slow cooker. Lower the heat to medium.
Add the onion, carrot, and shallot to the pan and cook for 2 minutes. Pour in the wine and scrape the bottom of the pan to release all the flavorful bits of glory. Bring to a boil and cook for 2 minutes.
Add the broth, 1 teaspoon salt, and plenty of pepper. Taste and add more salt if needed. Add the liquid to the ribs in the slow cooker; they should be almost completely submerged. Add the thyme and rosemary sprigs (whole) to the liquid.
Cover with the lid and place the slow cooker on low for 6 hours. The ribs should be fork-tender and falling off the bone. At the last minute, skim the fat off the top of the liquid.
Serve warm over mashed potatoes spooning a bit of juice over the top.