Rum Raisin Sandwich Cookies

I found this in my collection of recipes from here and there and everywhere, meaning I don't know here it came from. I know I have made it because it has a star sticker on it - I always place a sticker on the recipes I make so I can remember which ones I've tried. This one has a silver star. At one time, I had a color-coded sticker system - silver meant we liked it, not LOVED it. At some point, however, I ditched my system because I couldn't find anything BUT silver stickers around the house - so I started sticking silver stickers everywhere....I'm going to go ahead and post it....I'll have to make these sometime soon so I can update this description....Chilling time for the dough is included in prep time.

• Ready In: 1 hr 50 mins
• Serves: 36

Ingredients

• 1  cup powdered sugar
• 1  cup butter
• 1  egg
• 2 1⁄2 cups flour
• 1⁄4 teaspoon cream of tartar
• 1  cup raisins, finely chopped

• Rum Filling

• 2  cups powdered sugar
• 1⁄4 cup butter, softened
• 2  tablespoons milk
• 1⁄4 teaspoon  rum extract

Directions

1. Mix powdered sugar, butter and egg.
2. Stir in remaining ingredients except Rum Filling.
3. Divide dough in half.
4. Shape each half into a roll, 10" long.
5. Wrap and refrigerate 2 hours or until firm.
6. Cut rolls into 1/4" slices.
7. Bake at 375°F for 7-9 minutes on ungreased cookie sheet.
8. Cool completely.
9. Prepare Rum Filling.
10. Put cookies together with 1 teaspoon filling each.