Since Baharat is a blend of many spices, it's hard to pick just one spice to replace it. However, a similar spice, known as "Ras el hanout," would be a great substitute. Ras el hanout usually contains the same spices as Baharat, along with ginger, mace, and fenugreek. You can also use Biryani Spice recipe, which has a lot of the same spices. Another option is to use any of the following spices that you have on hand: black pepper, allspice, paprika, coriander, cumin, cinnamon, cardamom, nutmeg, cloves, and chili. However, make sure you keep the same proportions used in this recipe. If you're making a batch, make note of the spices omitted, so that you can purchase and add them to the Baharat spice mix at a later time.