Combine all dry ingredients in a food processor and blend until finely ground.

Transfer the mixture to a bowl, add zest and juice from lemons and oranges, and coconut oil.

Mix until the ingredients form a sticky mass.

Spoon the mixture into a silicone mold (approx. 10 inches) or divide into smaller molds.

Press firmly into the mold(s).

Place the mold(s) into the freezer until firm.

For the marzipan layer, mix all ingredients in a large bowl until a pliable dough forms.

Remove the cake from the freezer and release it from the mold.

Cover the cake with the marzipan by hand.

Return the cake to the freezer.

Process the icing ingredients in a food processor until smooth.

Take the cake out of the freezer and cover it with the icing.

Decorate with pistachios, cranberries, ribbons, or a sprig of holly.