Preheat the oven to 300 degrees F.
Salt and pepper the short ribs. In a heavy pot, heat a couple tablespoons of olive oil over high heat. Sear the short ribs on all sides, about 2 minutes. Remove to a plate.
Reduce the heat to medium high. Add the carrots, garlic and onion and begin to cook, stirring. After a minute or 2, pour in the wine and broth and stir to combine. Set the short ribs back in the pot, put on the lid, transfer to the oven and bake until the short ribs are tender and literally falling off the bone, 2 1/2 to 3 hours.
Transfer the ribs to a board, then remove the meat from the bones and shred. Skim the fat from the top of the vegetables, return the meat to the pot and stir.
Meanwhile, bake the baguette until warm, about 10 minutes. Split it down the middle and spoon the short rib meat down the length of the bottom of the baguette. Then spoon the veggies and some sauce over the top. Place the other half of the baguette on top, then slice into pieces with a sharp serrated knife. Serve immediately.