4 Medium Size Onion
1 Cup vinegar
1/2 Cup water
2 tbsp sugar
1 tsp salt
In a jar add vinegar, water, sugar and salt, stir till the salt and sugar get dissolved.
Add the cut onion rings in the jar, make sure the vinger/water is above the onion rings, or else mould can grow.
Keep aside for 2 days and then use . it can be stored for 10 days.