I learned to make it growing up:
slice, peel, and core pineapple.(one large ripe pineapple) Chop into small pieces. Place in large bowl, cover with boiling water (4 cups). Allow to stand for 2 days. I've also done it in one day, start early in the morning, let it sit on counter all day till I come home and then make.
strain liquid from pineapple into a large saucepan. Stir in sugar (2 cups) until it dissolves. Heat to boiling.
Pour into hot sterilized jars. Seal when cold, Keep one week before using.
'Ono' good! on milkshakes, ice cream, pancakes And cocktails. It sounds like a lot a work but it's not.