I think that almond filling is usually made out of almond paste, if home made...wait, let me check something...
Yes, I was right...here's one I found online:
Almond Filling
Ingredients:
3 1/2 ounces almond paste
1/2 cup confectioners’ (powdered) sugar
1/4 cup butter or margarine
1/2 cup sliced almonds
Directions:
Combine almond paste, sugar, and butter in a small sauce
pan, stirring constantly over medium heat until smooth. Stir in sliced almonds.
hmmm, I wonder...does it need to be heated to mix it....
I'm
going to go do a little more research on this one. It seems there's
something called SOLO ALMOND FILLING in cans. We don't have canned
almond filling in our grocery stores.
ViolaB
http://community.tasteofhome.com/forums/p/643153/5408315.aspx#5408315