Pineapple Mint Jam - cooking recipe

Ingredients

4 c. (No. 2 1/2 can) crushed pineapple
1/4 c. lemon juice (2 lemons)
7 1/2 c. sugar
1 bottle Certo
3/4 tsp. spearmint flavoring
few drops green food coloring

Preparation

Mix well the pineapple and 3/4 cup water.
Add lemon juice. Add sugar to fruit in saucepan and mix well.
Place over high heat.
Bring to a full rolling boil and boil hard 1 minute, stirring constantly.
Remove from heat and, at once, stir in Certo.
Skim off foam with metal spoon.
Then stir and skim for five minutes to cool slightly and to prevent floating fruit.
Add flavoring and coloring.