For the vinaigrette, in a small bowl whisk the lemon, pomegranate molasses, garlic, salt, 1 teaspoon of the dried mint, 1 teaspoon of the sumac and olive oil until it is emulsified.: When you whisk the ingredients you should notice the dressing becoming slightly glossy and a bit thicker, that is the olive oil suspending in the acidic lemon base. The aroma should shift from sharp garlic to a bright, balanced scent where the molasses adds a faint fruity note. Use a small whisk or fork and whisk briskly so the oil incorporates evenly, and taste as you go so the salt and acidity are in harmony. A common issue here is not fully emulsifying, which leaves the dressing separated and it will not cling to the leaves. If that happens, whisk in a tiny spoon of mustard or another splash of oil to help bind it.
For the salad, toss the romaine, tomatoes, onion, radishes, and pita chips in a salad bowl. Dress the salad with the vinaigrette and toss. Dust with the remaining sumac, dried mint, fresh mint, and freshly ground black pepper.: As you toss, listen for the crisp snap of the romaine and the faint crunch of pita chips against the softer tomatoes. Visually, you want bright reds and greens evenly distributed with the pita chips adding golden flecks. Toss gently so you do not bruise the leaves or mash the tomatoes, and ensure the onion and radishes are spread through the bowl for balanced bites. The mistake to avoid is tossing too early with the dressing, which will soften the pita and wilt the lettuce; keep the dressing and the chips separate until you are ready to dress.
Dress the salad with the vinaigrette and toss: Once you pour the vinaigrette over the salad, you will feel the leaves take on a light sheen and the scent will become more unified, with lemon and sumac rising to the top. Toss using salad tongs or clean hands to lift and fold, so each piece gets lightly coated without becoming soggy. Aim for a light coating rather than drowning the greens, because excess dressing will weigh down the textures and make the pita limp. If the salad tastes flat after dressing, add a squeeze of extra lemon or a pinch more salt to brighten it.
Dust with the remaining sumac, dried mint, fresh mint, and freshly ground black pepper: The finishing dusting should be applied with a light hand, creating a visual speckle of deep red from the sumac and flecks of green from the dried and fresh mint . You will notice an immediate lift in aroma as the fresh mint hits the bowl, releasing cool menthol notes against the tangy sumac. Use a small spoon or your fingers to scatter the spices so they land evenly. Avoid adding too much sumac at once, which can make the salad overly tart; you can always add more after tasting.