Mixed berry pie is make with raspberries, blueberries, blackberries, and strawberries and it's one of the best pies out there. This recipe is a family favorite and everyone cheers when I pull a berry pie from the oven.
Place berries, lemon juice and sugar in 3 qt saucepan over medium high heat stirring occasionally.
Once the berries start to simmer, turn the heat down to medium and continue cooking for 5 minutes, or until the berries are very soft.
Pour about ½ cup of the juice into a bowl.
Mix the cornstarch into the juice
Return cornstarch juice mixture to the pot and gently mix.
Cook for 2 more minutes or until it starts to look thick.
Remove from heat and add the butter, stir to combine.
With a slotted spoon, ladle berries into an 8 inch pie shell that has been placed in a pie plate.
Top pie with pie crust with hole cut into the top for venting or use lattice method (here's a step by step guide on how to lattice a pie crust).
Brush the top of the pie crust with the beaten egg and sprinkle with additional sugar.
Bake at 400 degrees F. for 45 to 50 minutes. If the edges of the pie start to brown too quickly you can cover the edges with a 2 inch strip of foil around the edge of the pie.
Remove the pie from the oven and cool completely before serving.
Notes
When you use a slotted spoon to ladle the berries into the pie crust, you'll have some berry juices leftover. It makes excellent "syrup" for pancakes, waffles, or French toast.
You can use fresh or frozen berries for this recipe, both work great. If working with frozen berries just heat them up on the stove long enough to warm them up all of the way, it'll take a few extra minutes compared to fresh berries.