Salted Texas Chocolate Sheet Cake with Pistachios

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• 1 cup butter (unsalted, plus more for baking dish, 2 sticks)
  Ingredient note

  Source: 1 cup butter (unsalted, plus more for baking dish, 2 sticks)
• 2 cups all-purpose flour (plus more for baking dish)
  Ingredient note

  Source: 2 cups all-purpose flour (plus more for baking dish)
• ¼ cup + 2 tablespoon unsweetened cocoa powder (I used Hershey's)
  Ingredient note

  Source: ¼ cup unsweetened cocoa powder (I used Hershey's); Source: 2 tablespoon unsweetened cocoa powder (I used Hershey's)
• 2 cups sugar
  Ingredient note

  Source: 2 cups sugar
• 1 teaspoon baking soda
  Ingredient note

  Source: 1 teaspoon baking soda
• 1 teaspoon kosher salt
  Ingredient note

  Source: 1 teaspoon kosher salt
• 2 each large eggs
  Ingredient note

  Source: 2 large eggs
• ½ cup buttermilk
  Ingredient note

  Source: ½ cup buttermilk
• 1 teaspoon + 1 teaspoon vanilla extract
  Ingredient note

  Source: 1 teaspoon vanilla extract; Source: 1 teaspoon vanilla extract
• ¼ cup unsalted butter (1/2 stick)
  Ingredient note

  Source: ¼ cup unsalted butter (1/2 stick)
• 3 tablespoon milk (I used 2%)
  Ingredient note

  Source: 3 tablespoon milk (I used 2%)
• 1½ cups powdered sugar
  Ingredient note

  Source: 1½ cups powdered sugar
• 1 cup unsalted roasted pistachios (roughly chopped)
  Ingredient note

  Source: ½ to 1 cup unsalted roasted pistachios (roughly chopped); upper source range endpoint used for shopping.
• 1 teaspoon sea salt
  Ingredient note

  Source: 1 teaspoon sea salt

1. Preheat oven to 350℉. Butter and flour a 9x13 inch baking pan.
2. In a small sauce pan, add the cocoa powder for the cake (1/4 cup), 1 cup of butter, and a cup of water. Bring to a boil, whisk and remove from heat. Set aside.
3. To a large bowl, add sugar, baking soda, salt, 2 cups flour and whisk. Make a well in the center and add the eggs, buttermilk and vanilla extract. Whisk or mix with a fork and gradually incorporate the dry ingredients. Add the cocoa/butter mixture and whisk until smooth. Pour batter into prepared baking dish and smooth the top. Lick the bowl.
4. Bake cake for about 35 minutes. Test doneness by inserting a toothpick in the middle, it should come out clean.
5. A few minutes before cake is done baking, make the frosting. In a small sauce pan, add butter, milk and cocoa powder and turn the heat to low. Whisk occasionally until butter is melted and mixture is smooth. Do not let boil. Remove from heat and whisk in the powdered sugar and vanilla.
6. Pour warm frosting over the warm cake and smooth it out. Top with pistachios and sea salt.
7. Serve warm or room temperature.