Chop tomatoes into small pieces.

Measure 3½ cups tomatoes into medium saucepan.

Bring to a boil, stirring often.

Simmer tomatoes for 10 minutes, stirring often.

Stir in lemon juice and basil.

Stir in pectin and bring to a full rolling boil, stirring constantly.

Add sugar and return to boil.

Boil hard for 1 minute.

Ladle into clean jars and process for 10 minutes in boiling-water bath.