Strawberry Jam - cooking recipe

Ingredients

2 qt. strawberries
1/2 tsp. butter
7 c. granulated sugar
1 envelope Certo

Preparation

Hull, wash and mash the berries.
Add the sugar.
Stir up real well.
Add 1/2 teaspoon butter.
Put on stove.
Bring to a full rolling boil, one that can't be stirred down.
Stir occasionally before it comes to a hard boil.
Add the Certo, stirring constantly.
Boil real hard for 1 minute.
Remove from stove. Stir and remove any foam, then pour into hot jars and seal immediately.
Fill jars 1/8-inch from the top.