Heat 1 tablespoon of the oil in a large skillet over medium-high heat, and, working in batches, brown the meat on all sides.
Use a slotted spoon to transfer each batch of browned meat directly to the slow cooker, then continue browning. Wipe out the pot between batches if a lot of liquid has accumulated at the bottom, to ensure even browning.
Pour in the coconut milk and stir continuously to release the browned bits on the bottom of the pan.
Add the tomato paste, curry paste, fish sauce, lime juice, and salt, then pour the mixture over the beef.
Cook on high for 5 hours or low for 8 hours. Add the broccoli, carrots, and jicama during the last 30 minutes of cooking on high or the last hour on low. Serve garnished with the cilantro.