I make fresh blackberry pie.
Bake 2 pie shells.
Crush enough berries to make about a cup and a half or so of juice, sweeten (how much depends on how sweet the berries are), add a dash of lemon juice, thicken with cornstarch or unflavored gelatin.
Pile the fresh berries in your pie shell (sweetened if they need it), pour the thickened juice over the berries, making sure you get them coated. This is what makes them hold together. Refrigerate to set.
If you don't have enough berries to crush and make juice, you can use blackberry jello.