2-3 leeks, white and light green parts, chopped and washed
2-3 carrots, peeled and cut into 2 inch pieces
2-3 celery stalks, cut into 1/2 inch pieces
1 cup fresh parsley leaves, and thin stems
2 tablespoons kosher salt
1 1⁄2 tablespoons tomato paste
3 tablespoons soy sauce
2 garlic cloves
1/4 cup cilantro leaves
Process everything, except tomato paste and soy sauce, in food processor, scraping down sides of bowl frequently, until paste is as fine as possible, about 3 to 4 minutes.
Add tomato paste and process for one minute, scraping down sides of bowl every 20 seconds.
Add soy sauce and continue to process one minute longer.
Transfer mixture to airtight container and tap firmly on counter to remove any air bubbles. Press small piece of parchment paper against surface of mixture and cover.
Freeze up to 6 months.
Use 1 tbsp to one cup boiling water to make broth.
Adapted from Food.com
