Why This Recipe Works

A good vegetable stock is an important ingredient to have on hand, but supermarket offerings don’t taste like vegetables, and traditional homemade versions are expensive and time-consuming to make. In our recipe, we grind a selection of fresh vegetables, salt, and savory ingredients to a paste that we can store in the freezer and reconstitute as needed. Leeks provide good allium flavor, and a small amount of freeze-dried onions support the fresh flavor of the leeks. Tomato paste and soy sauce provide an umami boost.

Before You Begin

For the best balance of flavors, measure the prepped vegetables by weight. Kosher salt aids in grinding the vegetables. The broth base contains enough salt to keep it from freezing solid, making it easy to remove 1 tablespoon at a time. To make 1 cup of broth, stir 1 tablespoon of fresh or frozen broth base into 1 cup of boiling water. If particle-free broth is desired, let the broth steep for 5 minutes and then strain it through a fine-mesh strainer.

Instructions

Process leeks, carrots, celery root, parsley, minced onions, and salt in food processor, scraping down sides of bowl frequently, until paste is as fine as possible, 3 to 4 minutes. Add tomato paste and process for 1 minute, scraping down sides of bowl every 20 seconds. Add soy sauce and continue to process 1 minute longer. Transfer mixture to airtight container and tap firmly on counter to remove air bubbles. Press small piece of parchment paper flush against surface of mixture and cover. Freeze for up to 6 months.