Preheat oven to 170°C for 15 minutes.
In a large bowl, beat the sugar, salt, treacle or golden syrup, ginger, and butter together with an electric mixer on medium speed for 2 minutes.
Add remaining ingredients and whisk until mixture forms a thick dough.
Place on floured work surface. Roll out and press into Gingerbread Mould.
Place on a baking tray and bake in oven for 20 minutes or until firm to touch (dough will crisp up as it cools).
Cool thoroughly before removing from mould.
ROYAL ICING:
Place sugar and cream of tartar in a medium bowl
Gradually add egg whites, whisking constantly with an electric mixer until the mixture forms a thick white paste. The whisk should be able to stand upright in the mixture
Add more icing sugar if necessary
Keep icing covered in an airtight container or covered with a damp cloth at all times to prevent hardening
To use, place in a zip-lock bag and push the icing down to one corner. Snip a tiny corner from the bag and pipe icing.
Assemble the house as per product instructions.