Before you put the beef into the slow cooker, I recommend browning it in a skillet for a few minutes. I know it seems like an extra step, but trust me—it’s worth it. Browning the beef helps develop a rich, caramelized flavor that will make the dish even more delicious. Heat a bit of oil in a large skillet over medium-high heat, then add the beef and cook for about 2-3 minutes per side, just until it’s browned. It doesn’t need to be fully cooked at this point; the slow cooker will finish the job. Once browned, transfer the beef to the slow cooker.