Ingredients

6 whole cloves 

2 medium yellow onions 

2 cups dry white wine 

1/2 cup white-wine vinegar 

2 medium carrots, peeled and coarsely chopped 

1 large rib celery, leaves attached, trimmed and coarsely chopped 

3 sprigs fresh flat-leaf parsley 

1 sprig fresh thyme 

1 dried bay leaf 

1/2 teaspoon coarse salt 

Trimmings and bones from 2 to 3 lean white, non-oily fish 

Preparation

Stick 3 cloves in each onion and transfer to a large pot along with 1 1/2 quarts water, wine, vinegar, carrots, celery, parsley, thyme, bay leaf, and salt. Bring to a boil over high heat.

Add fish trimming and bones and reduce heat to a simmer. Cover and cook for 1 hour. Strain stock through a fine mesh sieve lined with cheesecloth into a large pan. Place pan over medium-high heat and reduce to about 8 cups; season with salt.

Cool completely before storing.