Slice the onion into half-moons.
Place the pork roast into the base of the slow cooker and season with salt and pepper. Sprinkle the onion slices on top. Pour the orange juice, lime juice and minced garlic on and around the pork and season with the ground cumin.
Set the slow cooker on low and cook for 8 hours. Once finished cooking, shred the pork with 2 forks and mix into the sauce. Strain meat from liquid, before adding the plates.
Cook the rice, as directed.
Warm the black beans.
Peel and slice the orange for garnish.
Serve Slow Cooker Shredded Mojo Pork topped with orange slices with rice and black beans.