To make the chutney: Combine sugar, vinegar, ginger, garlic, cumin, cinnamon, cloves and red pepper in a large saucepan. Bring to simmer over low heat, stirring occasionally, until sugar dissolves. Add rhubarb, onion and raisins. Increase heat to medium-high and cook until rhubarb is tender and mixture thickens slightly. Remove from heat and let cool completely.
To cook pork: Sprinkle pork with cumin, salt and pepper. Heat oil in large, heavy skillet over high heat. Add pork and brown on all sides, about 5 minutes.
Transfer pork to roasting pan. Brush with about half the chutney.
To Freeze: Freeze in an oven ready container.
To Reheat: Bake at 400 degrees for 25 minutes from defrosted until pork is cooked through. From frozen, bake for about 75 minutes, or until pork is cooked through.
Serve with left over chutney.