Preheat oven to 170˚C bake or 150˚C fan bake.
Line 3 large baking trays with baking paper.
Sift flours, ginger and baking soda together. Using an electric mixer, beat butter, Chelsea Raw Caster Sugar and Chelsea Golden Syrup until light and fluffy. Add eggs, one at a time, beating until combined after each addition.
Beat on medium speed for 2 minutes or until creamy (mixture may appear curdled at this stage). Add half the flour mixture. Beat on low speed until combined. Repeat with remaining flour mixture. Stand for 5 minutes.
Spoon two level teaspoons of mixture, on top of each other, onto prepared trays. Repeat with remaining mixture, leaving 5cm between each for spreading. Bake, one tray at a time, for 13 to 15 minutes or until golden and just firm to touch. Cool on trays.
Using an electric mixer, beat butter until light and fluffy. Gradually beat in Chelsea Icing Sugar until well combined. Beat in Chelsea Golden Syrup. Spread two to three teaspoons of filling onto flat side of half of the biscuits. Sandwich with remaining biscuits.
Spooning teaspoons of mixture on top of each other will result in even-sized rounds.
Ginger kisses are best eaten on the day they're made.