Marinated White Onions - cooking recipe

Ingredients

8 cups onions (sliced to approx. 1/4 inch thickness)
2 cups white vinegar
3 cups sugar
1 teaspoon yellow mustard seeds
1 teaspoon celery seed
2 teaspoons salt
3 tablespoons yellow mustard (or less, to your taste)
1 tablespoon turmeric (safran)

Preparation

Put the sliced onions, vinegar, sugar, mustard and celery seeds, and salt in a large metallic pot.
Cook at medium-high for 15 minutes.
Remove from heat, and add the remaining ingredients. Bring to a boil.
Gently put the onions in the sterilised jars, and add marinade to cover.
Seal immediately.