Combine peaches, lemon juice and pectin in a large pot or Dutch oven. Bring to a rolling boil, stirring gently. Add sugar and return to rolling boil. Boil hard for 1 minute, stirring constantly. Remove from heat. Skim any foam. Add almond extract at this point, if desired, and mix.
Pour into hot jars, leaving ¼" head space.
Adjust caps, and process 10 minutes in boiling water bath. OR I USE THE 5 MINUTE INVERSION METHOD