For the most traditional flavor, use salty country ham.  Black-eyed peas can technically be prepared using nothing more than salt and water. The taste of the beans can be rather dull on their own, however, and it is more traditional to prepare them with pork and certain vegetables. Smoked ham steak makes a good choice when cooking black-eyed peas using the alternative slow cooker method. A ham bone works, as well. Use a sweetened ham, like a honey-baked ham, if you want a sweeter taste. Bacon or pancetta are also popular choices to use when preparing black-eyed peas. The vegetables should be chopped into small pieces with a sharp kitchen knife.  Give the onions a rough chop until the pieces are roughly 1/2 inch (1.25 cm) in size. Use a tangier variety, like a white onion or yellow onion, for a heartier taste. Use a sweet onion variety, like a Vidalia onion, for a milder, sweeter taste. You could also use 1/4 cup (120 ml) dried minced onion flakes instead of the whole onions to save time. Dice the tomatoes into 1/2 inch (1.25 cm) chunks, saving the juice. To save time, you can also use a 12-oz (375 ml) can of diced tomatoes. For a spicier twist, select a can a diced tomatoes with chopped green chili peppers.  Place the garlic on your cutting board with the broad, dull side of the knife blade held against it. Carefully yet forcefully smack the knife down to break open the garlic and remove the skin. The garlic can be used this way, or you can also mince the garlic into fine pieces with a knife. Alternatively, you can use 1/4 tsp (1.25 ml) of garlic powder, instead. Heat the oil in a large stockpot over medium-high heat. Add the ham and cook for 4 minutes or until the edges begin to crisp up, stirring frequently. This step is only optional. You can prepare the beans without crisping up the pork first.

TL;DR in Chinese:
选择上等的火腿。 切蔬菜。 用油加热火腿。