16 Pie Crust Crimping Techniques Every Home Baker Should Try - Tasting Table
Briefly

"Crimping can achieve two objectives, depending on the shape and style of your pie. If you're working with a double-crusted pie, the crimp will fuse the two layers together and prevent any of the liquid inside from seeping out."
"If you're working with a single-layer crust, crimping is a neat way to tie up any of the loose, scrappy edges that would otherwise burn if they were left to droop over the sides."
Read at Tasting Table
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