01 - Preheat oven to 350°F and grease a 9x5-inch loaf pan; line with parchment paper.
02 - Whisk together flour, baking soda, ginger, cinnamon, cloves, nutmeg, and salt in a medium bowl.
03 - In a large bowl, beat unsalted butter with brown sugar until light and fluffy.
04 - Mix molasses into the creamed butter and sugar, then add eggs one at a time, blending well after each addition; stir in vanilla extract.
05 - Alternately add dry ingredients and milk to the wet mixture in three portions, starting and ending with dry; mix gently until just combined to avoid overmixing.
06 - Pour batter into prepared pan, smooth the surface, and bake 45 to 50 minutes or until a toothpick inserted comes out clean.
07 - Let cool in pan for 10 minutes, then transfer to a wire rack to cool completely.
08 - Whisk powdered sugar and lemon juice until smooth and pourable; stir in lemon zest if desired.
09 - Drizzle glaze over cooled loaf and allow to set before slicing.