carrot cake with choco frosting

cake batter:

2 cups sugar
1 1/3 cups vegetable oil
3 eggs,
1 teaspoon pure vanilla extract

2 teaspoons ground cinnamon
2 teaspoons baking soda
1 1/2 teaspoons kosher salt

2 1/2 cups sifted flour 

3 cups (300 g) grated carrots, about 3 large ones

1 cup raisins
1 cup chopped walnuts

1/2 cup diced fresh pineapple

mix wet together, add dry to wet then fold the carrots and raisins. 

pour into a 9x13 baking pan lined with parchment paper. 

bake 350F for 35-40 minutes.

while the cake is baking start the frosting. 

choco frosting:

1/4 cup (1/2 stick) unsalted butter
3 tablespoons whole milk
2 tablespoons unsweetened cocoa powder
1 1/2 cups powdered sugar
1 teaspoon vanilla extract

Combine milk, 1/2 cup butter and 4 tablespoons cocoa powder in a large saucepan over medium low heat.  

Bring to a low boil whisking constantly.  

Remove from heat.