The classic double cooked pork is thinly sliced and crisp, with melt in your mouth leeks. I grew up eating my mom's version, where we slice the pork slightly thicker so it comes out more tender/less dry. Since she's from Sichuan, she definitely has more spicy tolerance than me, so add the doubanjian sauce to your taste. We also bulk it up with more veggies - I always do cabbage and leek - but you could also add sliced carrots, bell pepper, jalapenos, dou gan (豆干), whatever you have.