Pre-heat the oven to 180°C / 160°C fan assisted oven / gas mark 4 and line and grease a 9 inch x 5 inch loaf tin.
Place the sugar, butter and zest from the lemons (save the juice for the drizzle) in a large mixing bowl and beat on a high speed for 5-6 minutes until very light and creamy. Scrape the sides down every so often.
Add the eggs in one at a time and beat well.
Whisk together the sorghum flour, ground almonds, baking powder and salt then beat it into the rest of the cake mixture.
Pour the cake mixture into the tin and smooth down the surface.
Bake for 55-60 minutes or until an inserted toothpick comes out clean.
Remove the cake from the oven and place on a wire rack.
Juice the lemons then gradually stir the juice into the sugar in a bowl to make a thick sludgy mixture. You may not need all the lemon juice depending on how big the lemons are. You want the sugar to be just pourable but not runny.
Spoon the drizzle over the cake still in the tin so that the cake is completely covered in sugar.
Cool the cake for 1 hour in the tin so that the sugar has formed a solid crust then remove the cake from the tin to finish cooling on the wire rack.