Step 1 : Introduction to the question "1. I'm a cruel dictator, but if you add a former Japanese city to my surname you'll get a starchy crop. "
...1. Pol Aspar 2. Pol To 3. Pol Pot 4. Pol Broc Pol Pot was leader of the Khmer Rouge in Cambodia. An estimated 1 to 3 million people died as a result of his policies. Until 2010 the Ato was an independent city, but it has merged into the city of Yamaguchi. If you put Pot and Ato togehter you get potato. I made up the other names. Broccoli, tomato or asparagus aren't starchy.