Rinse the farro under cold water.
In a saucepan, bring vegetable broth to a boil.
Add the farro to the boiling broth and reduce to a simmer.
Cook for about 30 minutes or until the farro is tender but chewy.
Drain any excess liquid and let the farro cool.
Chop the vegetables: tomatoes, cucumber, bell pepper, and onion.
In a large bowl, combine the cooked farro and chopped vegetables.
Drizzle with olive oil and lemon juice, then mix well.
Add salt, pepper, and feta cheese, folding gently to combine.
Serve chilled or at room temperature.