Step 2

To make the filling: In a large bowl, cream together the butter and sugar, add the egg, vanilla and lemon zest and using a handheld electric whisk, whisk for a few minutes or until the mixture becomes thick and takes on a consistency similar to a mousse.

Step 3

Add the ground almonds and flour and mix until you have a creamy mixture.

Step 4

Spread a bit of the filling on the bottom cut side of the croissant, put the top on, spread a little more on top, sprinkle with some almonds and place on a parchment paper lined baking sheet. Continue with the remaining croissants, then bake them at 350 degrees for about 20 minutes.

Step 5

Sprinkle over some confectioners sugar and dig in!