To make the Homemade Strawberry Jam: Combine 2 cups chopped strawberries and 1 1/4 cups sugar in a saucepan and bring to a boil over medium heat. Stir in 2 tablespoons lemon juice and 1/2 teaspoon lemon zest and cook, stirring occasionally, until thickened (the jam should reach 220˚ F on a candy thermometer), about 15 minutes. Transfer to a bowl and let cool to room temperature, then refrigerate until chilled.