Preheat oven to 350 degrees

Zest lemon and squeeze juice into a bowl

Combine the first 4 ingredients with the lemon zest and set aside

In a separate bowl cream butter and sugar. Stir in egg and 1 ½ tablespoon lemon juice

Add flour mixture ½ cup at a time until dough forms

Divide dough in half and roll each half into a 12" log

Cut each log into 12 equal 1" pieces then roll each piece into a ball using your hands.

Lightly roll each cookie ball through granulated sugar until coated

Place each ball 1 ½" apart on an ungreased cookie sheet and lightly press the center of each with your thumb

Bake at 350 for 8-10 minutes

Allow cookies to cool completely

Place a scoop of vanilla ice cream onto the flat side of one cookie then top with another and squeeze together lightly

Stand each sandwich on its side and roll through the sprinkles

Place cookie sandwiches back in the freezer to set before serving.