Maryland Crab Soup

The instructions say to bring it to a boil but do not boil! I am assuming that this means once you first see it boiling to take it off the heat.1 28-oz. can tomatoes or 4 or 5 fresh tomatoes* 
1 17-oz. can corn or 3 ears*
1/4 lb. butter 
1 lb. claw crab meat 
1 bunch parsley 
1 qt. milk 
*If fresh vegetables are used, use 1 qt. water to cook them

Put tomatoes on to boil about 10 minutes, then add corn and cook about 10 minutes more.
Add crab meat and butter and cook about 10 minutes more.
Add chopped parsley and milk and bring to boil. Do not boil. Huh????🤪
Serve.

Unknown serving size