Preheat the oven at 175 degrees Celsius.
Butter a round baking form with a hole in the middle. Sprinkle it with the bread crumbles.
Melt the margarine in a casserole, stir down the saffron in the casserole.
Whip the eggs and the sugar white and fluffy. Add the melted margarine, flour, baking powder and the glögg and stir well.
Pour the batter in the baking form and place in the middle of the oven for 30 minutes. Take out the cake and let it cool down.
Mix the icing sugar and the water and pour it nicely over the cake. Decorate with the lingon berries.