Preheat oven to 350˚. Grease a 9x5 baking pan with butter.
Add butter to a small saucepan and melt on low heat. Set aside. Add cottage cheese to a food processor or blender and pulse until pureed.
Using a stand mixer, add melted butter, cottage cheese and sugar. Mix on medium low for 2 minutes or until blended. Mix in lemon juice and salt. Add eggs, one at time until blended. Turn mixer down to low and gradually add in flour until fully incorporated.
Pour batter into prepared pan and bake approximately 60-70 minutes or until done. Allow cake to cool in pan for 10 minutes, then gently remove from pan and let cool on a wire rack.
To make glaze, whisk together powdered sugar and lemon juice. Pour over cooled cake, letting it drizzle down sides. Sprinkle with crushed pistachios. Chill until ready to serve.