Ginger-molasses Skillet Cake

• 12 cast iron skille place the skillet in the oven to melt the butter
• 240 ml cream (heavy)
• 160 ml molasses
• 220 gr brown sugar
• 220 gr dark brown sugar
• 170 gr all purpose flour
• 160 ml milk
• 120 ml sour cream
• 65 gr butter (unsalted)
• 30 ml molasses in