To the second bowl of bulgur, add the beef, garlic, lemon zest, salt and spices. Mix well. Divide the mixture into 8 equal portions. With lightly oiled hands, form one portion of meat at a time into a 5-inch (12.5 cm) long sausage. Thread each sausage onto a skewer or chopstick, if desired. Set aside on a large plate. Lightly oil the keftas.