In a large mixing bowl, add in the sweetened condense milk, yolks, lime juice and blackberry juice. I used fresh blackberries and pressed them through a sieve to get my juice. It will take about 1 to 1 1/4 cups of fresh blackberries to get enough juice.
Mix until combined. Pour into the graham cracker crust.
Place in the oven at 350 and bake for 22 minutes or until the center is set.
Let cool and place in the fridge for 3 hours to overnight to finish setting up.
Cut and serve.