Spelt Swedish Gingerbread

Name: Spelt Swedish Gingerbread
Cuisine: European
Ingredients: 100g (3½ oz) lingonberries (frozen); 100g (¼ cup + 3 tbsp) butter (melted); 160g (¾ cup + 1 tbsp) sugar; 2 eggs (medium - weighing approx. 130g); 100g (3½ oz) gräddfil (see note 1); 2 tsp cinnamon; 1½ tsp baking powder; ½ tsp baking soda; 2 tsp ginger (see note 2); ⅛ tsp ground cloves; ¼ tsp cardamom; 180g (1½ cups) spelt flour (see note 3); 2 tbsp gräddfil (see note 1); icing / powdered sugar (as much as required); lingonberries (for decoration)