Rinse the blackberries under cold water and drain them well. In a large saucepan, combine the blackberries, granulated sugar, lemon juice, and lemon zest (if using). Place the saucepan over medium-high heat and bring the mixture to a boil, stirring frequently. Once boiling, reduce the heat to medium-low and let the mixture simmer for about 20-30 minutes, stirring occasionally, until it thickens and reaches the desired jam consistency. To test if the jam is ready, place a small amount on a chilled plate and let it cool for a few seconds. Run your finger through the jam – if it wrinkles and holds its shape, it's done. If not, continue cooking for a few more minutes and test again. Once the jam is ready, remove the saucepan from the heat and let it cool for a few minutes. Transfer the blackberry jam into clean, sterilized jars, leaving about 1/4 inch of headspace. Seal the jars tightly with lids and let them cool to room temperature. Store the jars of blackberry jam in the refrigerator for up to 2 weeks, or process them in a water bath canner for longer shelf life according to proper canning procedures. Spread this delicious homemade blackberry jam on toast, biscuits, or use it as a delightful filling for your favorite cakes and pastries! Enjoy the taste of summer all year round with this delightful treat. #recipes #blackberry #jam #easyrecipe #fruitspread
