Pear Jam - cooking recipe

Ingredients

4 1/2 cups pears, finely chopped
5 cups sugar
1/4 cup lemon juice
1/2 cup crushed pineapple, drained
1/2 teaspoon butter
1 (1 3/4 ounce) package premium fruit pectin

Preparation

In a large pot, put the pears, fruit pectin and lemon juice, bring to a full rolling boil and cook until thickened, stirring constantly. Add butter to keep from foaming.
Stir in sugar quickly. Return to full rolling boil and boil exactly 1 minute.
Remove from heat and skim off any foam.
Ladle into jars filling to within 1/8 inch of tops.