Preheat oven to 350°F. Add shortening, sugar, eggs, buttermilk, and lemon zest to Mix n Blend II blender jar. Secure lid and select "Batter." Add flour, baking soda, and salt to jar and secure lid. Press "Pulse" 4–6 times or until flour is incorporated.
Pour batter into 2 greased loaf pans. Bake for 30–35 minutes or until toothpick inserted in center of loaf comes out clean.
Meanwhile, add powdered sugar and lemon juice to clean jar, secure lid, and select "Sauce." After removing loaves from oven, pour glaze over tops of loaves.