In a bowl combine bulgur and water. Soak bulgur 1 hour and 15 minutes. Bulgur may be prepared 1 day ahead and chilled, covered. Mince enough onion to measure 1 cup and in a bowl stir together with salt, allspice, and cinnamon. Let onion mixture stand 30 minutes. Finely chop parsley and mint. Finely chop enough scallion greens to measure 2/3 cup. Quarter and seed cucumber and tomatoes and thinly slice. In a bowl toss together all salad ingredients with salt and pepper to taste. Salad may be made 1 hour ahead and chilled, covered.