i have made this cake many times and it works well with lemons also. The cake is gluten and lactose free.
2/3 cup dairy free spread melted and cooled
1 tablespoon finely grated orange zest
2/3 cup castor sugar
1/4 cup lactose free milk or almond milk
Mix the ingredients well then add
1 and 3/4 cup of gluten free flour
Spread mixture into a silicone baking pan and bake for about 40 mins in preheated oven set to 160. Check cake is cooked before removing from oven. When the cake is cooked and cooled ice with 3/4 cup icing mix combined with 2 tablespoons of orange juice let the icing drizzle down sides of cake.