Prepare the Grains: Rinse the pearled farro in a fine-mesh sieve under cold water until it runs clear; drain well.
Build the Aromatic Base: In a large Dutch oven over medium heat, warm the olive oil. Add the chopped leek; cook 5–6 minutes until softened. Stir in the garlic; cook 1–2 minutes until fragrant.
Toast the Farro: Add the farro and lemon zest; stir 1 minute to coat in the aromatics.
Simmer the Farro: Pour in the vegetable broth; bring to a boil, then reduce to the lowest heat, cover, and simmer 17 minutes.
Finish Cooking & Check Doneness: Stir in the whole-wheat orzo; cover and simmer 8–10 minutes more, until the farro is tender-chewy and the orzo is al dente with most liquid absorbed. If the pot looks dry before the grains are done, add a splash of hot water or broth.
Rest and Steam: Turn off the heat. Stir in the rinsed chickpeas, cover, and let stand 10 minutes.
Finish and Serve: Fluff with a fork. Fold in the parsley, mint, dill, lemon juice, and black pepper; season with kosher salt to taste. Serve warm.