Wendy's carrot cake

My very good friend Wendy makes the best NZ carrot cake. It is absolutely delicious. The last time she made it for me was on my birthday, the girls surprised me with a party at Hot Water Beach Hot Pools, so we took the cake, dug a whole and soaked in the rain, munching this beautiful cake...

Ingredients:
1 cup oil, 2 cups sugar, 4 eggs, 3,5 cups grated carrots, 1 cup mashed bananas,
half cup raisins, 1tablespoons vanilla essence or 1 pkt vanilla sugar,
3 cups flour, 1 teaspoon baking soda/natron, 1 teaspoon baking powder,
1teaspoon cinnamon, 1 teaspoon cocoa (this is optional)
Frosting:
120g cream cheese/philadelphia frischkäse, 1/4cup butter, softened, 1 cup icing sugar,
2 tablespoons lemon juice, 2 - 1/4 cups icing sugar

Instructions:
Preheat oven to 180°C. Grate carrots into a bowl, add oil, sugar, 4eggs, bananas and raisins. Mix well. Stir in flour, vanilla essence or vanilla sugar, baking soda, baking powder and cinnamon. If chosen, add cocoa. Make a smooth mix.
Prepare 20cm baking tin with baking paper at the bottom.
Pour mix into prepared baking tin.
Bake for 1hour, then let cool on rack.

For the frosting:
Beat cream cheese and butter until combined. Beat in powdered suger and lemon juice.
Beat in 2-1/4 cups more of the powdered sugar till frosting is spreading consistency. Spread over the complete cake, sides included.