In a medium-sized bowl, sift together the GF Flour, Salt, Baking Powder, Baking Soda and Xanthan Gum. Set aside.
In a separate small bowl, whisk together the Milk, Lemon Zest, Lemon Juice and Vanilla Extract until well-blended. Set aside.
Using a Stand Mixer, fitted with the paddle attachment, beat the softened Butter and Granulated Sugar on Medium-High until light and fluffy.
Add the Eggs, one at a time, to the Butter mixture, blending until well-combined.
Reduce the speed to Low and begin alternately adding the Flour Mixture and Milk Mixture to the Butter Mixture. Continue mixing until all ingredients are combined, scraping the sides as needed.
Scrape the batter into the prepared Bundt pan and smooth the top.
Bake in preheated oven for 40-50 minutes, turning the pan halfway through baking. Cake is ready when it is a light golden brown and wooden skewer comes out clean.
Cool cake in pan for about 10-15 minutes before running a knife around the edges to loosen. Turn out onto a wire rack to completely cool before applying the glaze.