Melting moments with lemon buttercream

These tasty little things are just something I whipped up yesterday afternoon. There are two really cool things about these cookies. 1) there is only 5 ingredients in the recipe, and 2) they really do "melt" in your mouth! If you have not tried these tasty little things before, you need to!
ENJOY!

Lemon melting moments

• 250 g (1 stick)butter, softened
• 1/3 cup icing sugar
• 1 ½ cup flour
• ½ cup corn flour
• 60g (1/4 cup) butter, softened
• ½ cup icing sugar
• 1 teaspoon grated lemon rind
• 3 teaspoons lemon juice

Preheat oven to 150 C. (300 F)
Cream butter and sugar until lightly fluffy.
Sift flour and corn flour in to creamed butter mixture.
Mix until well combined.
Put mixture in a bowl and cover with plastic wrap, refrigerate for at least one hour.
On a cookie sheet, form small balls, about the size of a quarter, then lightly flatten just the tops with a fork. Make sure they are at least an inch apart.
Bake for 20 mins and cool on a rack.
Make cream filling. In a mixing bowl, combine butter, icing sugar, lemon juice and rind and beat until fluffy.
Put a small amount of butter cream between 2 cookies and sandwich together.