Ginger Cake

I've just made my gluten free ginger cake again, and I wrote the recipe down this time!! So, here it is, and it is DELICIOUS!!!
(apologies to anyone who has a gas oven, I don't know the equivalent temperature)

Ginger Cake

180g butter
2tblsp black treacle or molasses
120g dark brown, molasses or muscovado sugar
50g caster sugar
75g ground almonds
150g polenta
2 tsp baking powder
1½ tsp xanthan gum
4 tsp ground ginger
3 eggs
1tblsp milk

Preheat the oven to 180º
Melt the butter, sugar and black treacle/molasses in a pan over a gentle heat.
Mix the ground almonds, polenta, baking powder, xanthan gum and ginger in a large bowl.
When the butter/sugar mix is completely melted, pour it into the dry ingredients and mix well (use a food processor or electric whisk if you like).
Add the eggs and beat all together well. Add the milk to soften the mixture and beat well again.
Grease a rectangular baking tin and line with greaseproof paper. Grease the paper.
Pour the mixture into the tin and bake for 30 mins.
Remove from the oven and turn out onto a cooling rack. Remove the paper.
Cut into squares when cool.