1 1/4 sticks 10 (tablespoons) butter, plus some for greasing
1 cup golden syrup (such as Lyle's)
1 cup (packed) plus 2 tablespoons dark brown sugar
1 cup stout (such as Guinness)
2 teaspoons ground ginger
2 teaspoons ground cinnamon
1/4 teaspoon ground cloves
2 cups all-purpose flour
2 teaspoons baking soda
1 1/4 cups sour cream
2 eggs
1 rectangular aluminium foil pan or cake pan, approximately 13 by 9 by 2-inches