Being the oldest of 14 children and living in the northeast corner of Maine in the late 1930s and 40s, food had to go a long way and it had to be good. When we had this chowder it was a treat.
In a large stock pot cook potatoes and onions over medium heat until firm. While cooking render the salt pork in a small saucepan until it is golden brown; set aside.
Just before the potatos are done, add fish and slowly cook until they are firm and flaky. Pour in salt pork grease and evaporated milk. Stir gently without boiling. Place butter on top and let stand 10 minutes before seasoning to taste.