Place sugar and rice into Thermo bowl and mill 1 min/speed 10. Check that the grind is fine enough so that there is no gritty sensation between finger and thumb. If necessary, mill a further 1 min/speed 10.
Add butter and blend 6 sec/speed 6.
Add vanilla and flour and blend 6 sec/speed 6.
Add nuts and craisins and knead 1 min/Interval.
Push together with hands on Silpat mat and roll into a long sausage shape. Wrap and refrigerate 3o minutes.
Preheat oven to fan forced 180ºC and line a tray with baking paper.
Slice cookies across the roll in 1cm thick rounds, with your new spatula as it will not cut your Silpat mat. Place on prepared tray and cook 12-15 minutes until fragrant.
Dip one side into melted white or dark chocolate if desired.