Prepare the Bulgur:
Place the bulgur wheat in a large bowl and pour the boiling water over it. Cover and let it sit for 10–15 minutes until softened. Fluff with a fork to separate the grains.
Chop the Herbs and Vegetables:
While the bulgur soaks, finely chop the parsley, mint, tomatoes, cucumber (if using), and green onions.
Combine Ingredients:
Add the parsley, mint, tomatoes, cucumber, and green onions to the bowl with the fluffed bulgur.
Season the Salad:
Drizzle the olive oil and lemon juice over the mixture. Add a generous pinch of salt and pepper. Toss gently to combine, ensuring all the ingredients are evenly coated.
Taste and Adjust:
Taste the salad and adjust seasoning with more lemon juice, salt, or pepper as needed.
Chill and Serve:
Refrigerate the tabbouleh for at least 30 minutes to allow the flavors to meld. Serve cold or at room temperature.