Matcha Cake With Black Sesame Buttercream

Name: Matcha Cake With Black Sesame Buttercream
Ingredients: 1 1/3 Cup sugar; 2½ Cups all-purpose flour; 2 Tablespoons cooking grade matcha, such as Aiya; 1½ Teaspoon baking powder; 1½ Teaspoon baking soda; 1½ Teaspoon kosher salt; 2 eggs; 1 Cup buttermilk; ½ Cup canola oil; 1½ Tablespoon vanilla extract; ½ Teaspoon almond extract; ¾ Cup boiling water; 2 Cups unsalted butter, softened; 4 2/3 Cups powdered sugar; 6 Tablespoons toasted black sesame seeds, finely ground in a spice grinder; 2 Teaspoons vanilla extract; Pinch of kosher salt