To the slow cooker, add the roast with the fat side up. Pour in the orange juice and pour the Sweet Chili sauce on top of the beef. Sprinkle the curry powder, garlic salt and pepper over the roast and sauce. Set on low and cook for 8 to 10 hours. Once cooked, pull the beef apart using 2 forks, making the shredded beef.
Just before serving, make up the slaw by tossing together the shredded cabbage, carrots, chopped cilantro and the olive oil, vinegar, salt and pepper. If you like a tangy slaw, add more vinegar.
To serve, add the slaw onto a tortilla, top with shredded beef and a few cilantro leaves, roll up and enjoy!