strawberry jam recipe

Strawberries: This strawberry jam recipe starts with two pounds of fresh, hulled strawberries. To hull a strawberry, use a paring knife angled toward the center of the berry and cut a circle around the leafy stem to remove the hull. Sugar: Four cups of white sugar sweetens the jam, thickens the jam, and acts as a preservative. Lemon juice: Lemon juice is essential for getting the pectin to gel properly, setting the jam. It also helps prevent the growth of bacteria.