These are my favorite type of peas. Typically referred to simply as "field peas" in the South, I can make a meal from a bowl of these and some hot cornbread.
1 pound of frozen purple hull peas
water to cover by about 2 inches
4 slices bacon, diced OR 1/2 cup cubed ham or 1 ham hock
salt and pepper to taste
Bring peas and water to a boil over medium high heat in a large Dutch oven or cast iron pot. If you're using a ham hock, add it now.
Reduce heat to a simmer and cover.
Cook, stirring occasionally, for 1 1/2 - 2 hours. Add diced bacon or ham and let simmer for another 1/2 hour or so.
Add water as needed.