Peel the papaya then grate into thin strips. Coat the papaya strips well with 2 teaspoons of salt. Rinse and squeeze out any juice. Pat dry with paper towels.
Mix the sugar, vinegar and ½ teaspoon of salt in a large saucepan. Add the papaya strips and simmer for about 5 minutes. Add carrots and bell peppers and simmer for 5 minutes, or until carrots are tender.