In a large bowl, combine the strawberries with the lemon juice, stirring gently to coat the berries with juice.
In a 8-quart stock pot, alternately layer the strawberries and the sugar, don't make your layers to large, you want the berries to have lots of contact with the sugar. Cover and let stand 4- 5 hours.
Remove the cover from the pot with the berries and sugar. Over medium-low heat gradually heat the berry-sugar mixture while stirring constantly and gently. Heat and stir until the sugar is dissolved.
Stir in the butter (this helps prevent foaming) and increase the heat to medium-high, bring the mixture to a boil. Reduce heat and maintain the gentle boil for 10 minutes, stirring occasionally to prevent sticking.
Increase the heat to medium-high. Bring the strawberry mixture to a full rolling boil, stirring constantly and gently. Stir in the liquid pectin, and return the mixture to a rolling boil for 1 minute.
Remove pan from heat and skim off any foam that developed while boiling.
Allow the preserves to cool for 5 minutes. this cooling period prevents floating fruit in jars.
Gently stir the preserves to distribute the strawberries throughout. Ladle the preserves into prepared hot jars, leaving 1/4 inch of headspace . Wipe the threads and rims of the jars with a clean, damp cloth. Cover with lids and apply screw on lid bands.