Place bulgur wheat and water or broth in a medium saucepan and bring to a boil over high heat.
Reduce heat to low, cover, and simmer for 12 to 15 minutes until the liquid is fully absorbed.
Remove bulgur from heat and transfer to a large mixing bowl to cool completely.
Once cooled, add the chickpeas, diced cucumber, parsley, mint, and red onion to the bowl.
Stir in the crumbled feta cheese and roasted pistachios.
In a separate small container, whisk together the olive oil, lemon juice, salt, and pepper.
Pour the dressing over the salad and toss thoroughly to ensure even distribution of ingredients.
Serve immediately or refrigerate for 30 minutes to allow the flavors to meld.