Toss the grated papaya together with 4 tablespoons salt in a large bowl; allow to sit for 1 hour. Drain the liquid from the papaya and rinse thoroughly. Place the papaya in the middle of a large piece of muslin and squeeze to drain as much liquid from the papaya as possible.
Combine the papaya, carrot, red pepper, ginger, green chillies and raisins together in a clean large bowl; mix. Transfer the mixture to clean, dry jars with lids.
Stir the vinegar, water, sugar and 1 teaspoon salt together in a small saucepan; bring to the boil for 5 minutes. Pour the vinegar mixture into the jars, making sure the vegetables are completely submerged in liquid. Allow the vegetables to marinate in the liquid at least 1 day before using. Store in refrigerator between uses.
Try it! I live in North Mindanaw, Philippines and my sister-in-law in the mountains makes big jars of atsara - they have plenty of green papaya. I like to add radish, keep down the sugar and omit raisins, but the great thing about atsara is that you can please yourself. - 19 Jan 2014