Heat a deep skillet over medium heat. Add EVOO and onions and cook 3 minutes. Add raisins, rapini and season with salt. Add broth or water. Bring liquid to a bubble, then reduce heat to simmer and cover the pan. Cook rapini 12 minutes or until tender and no longer bitter. Remove lid and allow liquid to reduce by 1/2, 2 or 3 minutes. Transfer cooked rapini and plumped raisins to a serving dish.