Syrup: Bring the
sugar, water, vanilla bean, and cloves to a boil.
Boil for 15 minutes.
Wash down the pan
sides with a pastry brush dipped in cold water to
prevent sugar crystals from forming.
Cook, without
stirring, until the mixture reaches 238°F (114°C) or
the soft-ball stage.
Cookies: Preheat
the oven to 325°F/170°C/gas 3. Beat the butter and
sugar in a large bowl with an electric mixer at high
speed until creamy.
Add the egg
yolks, one at a time, until just blended after each
addition. With mixer at low speed, gradually beat in
the the flour and baking soda.
Roll to 1/4-inch
(5-mm) thick on parchment paper. Refrigerate for 15
minutes. Use a pastry cutter to cut out 1-inch
(2.5-cm) disks.
Lay them on a
cookie sheet covered with waxed paper. Bake for
15-20 minutes, or until golden brown. Cool the
cookies on the sheet. Serve in the lukewarm syrup.