Pour-in the vinegar and sugar in a medium pot and bring to a boil. When sugar dissolves, remove from heat and let it cool down. Set aside.
In a large bowl, place the grated/julienned papaya and add salt then mix until well incorporated. Let the papaya and salt mixture sit for a minimum of 30 minutes for the papaya juice to release.
Using cheesecloth (or clean kitchen towel) place papaya in batches and squeeze until all the liquid comes out and place squeezed papaya in another bowl.
You'll notice that the grated papaya is clumped up so loosen using your hands then pour 4 tbsp. vinegar and mix to incorporate.
Place the papaya in cheesecloth again and squeeze until all liquid is extracted. Place the papaya in the bowl and add the vinegar syrup, stir to incorporate.
Mix in the garlic, ginger and onion. Then add carrots, bell peppers and raisins. Mix then taste to adjust sweetness and sourness if needed.
Place the atchara in a sterilized airtight jar or any airtight container. Let ferment for a minimum of 24 hours or overnight in room temperature on in the refrigerator.
Serve cold with you favorite fried or grilled dishes. Bon appetit!