Preheat oven to 180c.
Grease and line a 20cm (8") square baking pan with baking/parchment paper and set aside.
Whisk together sifted flour, baking powder and dry spices and set aside.
250 g plain flour (all-purpose flour), 2 teaspoons baking powder, 2 teaspoons ground ginger, 1 teaspoon ground cinnamon, ¼ teaspoon ground cloves
In a large bowl, combine melted butter, brown sugars, molasses, golden syrup, vanilla and fresh ginger, mixing to incorporate.
170 g salted butter, 130 g dark brown sugar, 150 g light brown sugar, 1 tablespoon molasses, 1 tablespoon golden syrup, 1 tablespoon vanilla extract, 2 teaspoon finely grated fresh ginger
Mix in the egg, then fold in flour and spice mixture.
1 egg
Tip dough into the prepared pan, spreading it into the corners and smoothing the top.
Bake for 22 - 25 minutes, or until the sides are firm but the centre is still soft.
Allow to cool in the pan for 10 minutes, then remove from the pan and allow to cool completely on a wire rack.
To make the icing, combine the icing sugar and 1 teaspoon of lemon juice in a small bowl.
2 tablespoons icing sugar (confectioner's sugar), 2-3 teaspoons fresh lemon juice
Mix until you achieve the right consistency, adding lemon juice (¼ teaspoon at a time) as needed.
Pipe or drizzle icing onto bars then slice into squares and serve.