Add ½ cup of honey to a saucepan with ½ cup of sugar and put over a medium heat, add 1 tbsp of baking soda and mix really well. Stir continuously until it expands in size and turns golden brown and fluffy. (The deeper the brown colour, the darker and more flavoursome the honey taste will be, but be careful not to burn it.)
Turn off the heat and continue to stir before adding 2 tbsp of butter. Continue to stir until the butter melts in and smooth.
Add the honey mixture to the egg mix while mixing. It's important that you do this bit before the honey mix cools down too much, as then the honey will be too hard to mix.
Grease a 25cm diameter round cake tin with some butter and transfer the cake mixture to it.
Place the cake in a preheated oven at gas mark 3 or 4 and bake for 20 min.
Check that the middle of the cake is fully cooked by inserting a wooden skewer. If it comes out dry, it's done.
Place on a cooling rack and leave to cool