Line metal tin or plastic storage container with plastic wrap and set aside.

Add softened Breyers Natural Vanilla Ice Cream, key lime juice, and lime zest to food processor and mix until combined.

Pour ice cream mix into prepared container. Cover with an additional piece of plastic wrap and freeze until ice cream firms. From several hours to overnight depending on how firm you'd like the ice cream to be.

Crush graham crackers by placing two full graham crackers (or four halves) into plastic storage bag and crushing using a glass drinking cup by rolling it over the bag several times.

Once ice cream is at desired firmness, remove top piece of plastic wrap and using a small cookie scoop add to parfait dish (aka stemless wine glass), then cover with layer of crushed graham crackers and then repeat to desired level ending with graham cracker crumbs.

Add a little lime zest and some lime wedges to the top to garnish before serving immediately.

Repeat process for each parfait.