Servings: Makes about 2 quarts
Ingredients 2 Tbsp. extra-virgin olive oil2 medium yellow onions , coarsely chopped1 medium carrot , coarsely chopped2 leeks , white and light green parts only, coarsely chopped2 whole heads garlic , unpeeled, halved crosswise1 medium parsnip , peeled and coarsely chopped1 medium turnip , peeled and coarsely chopped1 rib celery , coarsely chopped1 cup fresh flat-leaf parsley , leaves only1 tsp. whole black peppercorns6 sprigs fresh thyme2 bay leaves1 large tomato , cored and coarsely chopped1 sprig rosemarySalt
Heat oil in a large pot over medium-high heat. Add onions and carrots and cook, stirring occasionally, until softened but not browned, 8 to 10 minutes. Add leeks, garlic, parsnips, turnips, and celery and cook, stirring occasionally, for 10 minutes. Add 10 cups water, parsley, peppercorns, thyme, bay leaves, tomatoes, rosemary, and a pinch of salt; stir well. Bring to a boil then reduce heat to medium-low, cover and simmer for 45 minutes.
Arrange a fine mesh sieve over a large bowl then strain broth through sieve, pressing on the solids to remove as much liquid as possible; discard solids. Cool broth quickly by arranging the bowl inside a larger bowl filled with ice water. Stir often until cool, then transfer to airtight containers and refrigerate for up to 2 days. Alternately, freeze the cooled broth for up to 2 months.
Adapted from Michy's restaurant and Cuisine à Latina by Michelle Bernstein. Copyright © 2008 (with permission from Houghton Mifflin).