In a small bowl, combine salt, fennel seed, paprika, basil and oregano and stir to combine. Rub mixture all over lamb roast. Make 5 slits in the roast and stuff a clove of garlic in each slit. Place in slow cooker and cover with diced tomatoes and juice. Cook on low for 8 hours.
Remove meat and shred. Return to slow cooker, stir in basil and season with more salt to taste. Serve over rice.