Use food processor to grind almonds; process almonds until very finely chopped.
To toast almonds, heat oven to 350°F. Spread almonds in ungreased shallow pan. Bake uncovered 6 to 10 minutes, stirring occasionally, until light brown. For the toasted, ground almonds, toast the almonds first, allow to cool, then place in the food processor to grind them.
Cake layers will stack more easily if they are flat. If cake layers are domed in the center, use a serrated knife to trim the cooled cakes so they are flat.