This Luxe, Goes-With-Everything Pistachio Frosting Will Forever Change You

Name: This Luxe, Goes-With-Everything Pistachio Frosting Will Forever Change You
Total time: 40 min
Yield: 48
Ingredients: 5 1/2 ounces egg yolk (shy 2/3 cup; 155g), from about 10 large eggs; 5 1/4 ounces plain or lightly toasted sugar (about 3/4 cup; 145g); see note; 1 ounce liqueur or amaro, such as Cardamaro, Maraschino, and rum, or just water (about 2 tablespoons; 30g); 1/2 teaspoon (2g) Diamond Crystal kosher salt; for table salt, use about half as much by volume or the same weight, or more to taste; 16 ounces unsalted butter (4 sticks; 455g), softened to about 65°F (18°C); Homemade pistachio paste to taste, up to 14 ounces (396g)