Place bulgur wheat in a medium-sized bowl and pour boiling water over it to cover. Lightly stir and cover the bowl with plastic wrap. Set aside for about 45 minutes without removing plastic. After 45 minutes, place bulgur in a fine-mesh strainer and press on it with a wooden spoon to remove any excess moisture.
Place bulgur wheat, tomatoes, cucumber, green onions, parsley (and mint, if using) in a mixing bowl and toss lightly. Add oil, lemon juice, salt, pepper, and cumin. Gently toss until everything is well distributed.
Cover the bowl and refrigerate a minimum of 1 hour before serving and preferably for 2-4 hours. Toss before serving.