Isian Pie Ceri yang Lezat

Bahan-bahan (4 porsi)

• 4 pint jars
• 4 cups fresh or frozen sour cherries ((pitted))
• 1 cup granulated sugar
• 1/4 cup cornstarch
• ¼ teaspoon almond extract
• 1 Tablespoon lemon juice
• 2 Tablespoon unsalted butter
• Red food coloring ((optional))