After you trim off the edges of the pie crust, you fill the pie with the desired filling. If you want to do a crumb or a lattice top, you do not trim off the edges, but instead finish the edges now.
After you trim off the edges of the pie crust, you fill the pie with the desired filling. If you want to do a crumb or a lattice top, you do not trim off the edges, but instead finish the edges now.