Preheat your oven to 350°F (175°C). Line a muffin tin with paper liners.
In a large bowl, whisk together the flour, baking soda, ground ginger, ground cinnamon, ground cloves, and salt.
In another bowl, mix the melted butter, brown sugar, molasses, buttermilk, and egg until well combined.
Gradually add the wet ingredients to the dry ingredients, mixing until just combined.
Divide the batter evenly among the muffin cups, filling each about ⅔ full.
Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean. Let cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.
To make the glaze, whisk together the powdered sugar and lemon juice until smooth. Drizzle over the cooled muffins.