Here's a recipe for Pickled Onions adapted from from Fancy Pantry which should work.
2 pounds onions
2 tablespoons non-iodized salt
2-3 bay leaves, torn into pieces
2 teaspoons whole black peppercorns
1.5 teaspoons whole allspice
1 tsp. mustard seed
2-3 hot peppers -dried
3 cups cider vinegar
1.5 cups rice wine vinegar
1. Place onions in boiling water for a minute. Drain and rinse with cold water. Peel. Mix with salt. Cover and let sit for about 8 hours.
2. Combine spices, vinegars and 1-2 additional teaspoons salt. Simmer for a few minutes. Strain.
3. Rinse onions and dry them. Pack into jars and cover with pickling solution.
4. Process 10 minutes.
5. Store 3 months before eating.
Jyoti
Jyoti
A meal, with bread and wine, shared with friends and family is among the most essential and important of all human rituals.
Ruhlman