Add water, onions, paprika, cumin, allspice, and salt in the pressure cooker on saute function. Cook for 6-7 minutes, stirring occasionally, and adding extra water if sticking. Add chickpeas, dates, and tomatoes and stir through well. Turn off saute function, and put on lid. Manually set to pressure cook (high) for 20 minutes. Then, let pressure release naturally (or release manually). Stir through, taste, add seasoning if desired, and serve. Serves 4-6 with cooked grain or potatoes (see note).