My neighbor brought me a basket of citrus fruit from her garden, and this was what I did to use up some of the lemons, along with most of the eggs in my fridge.
juice of 3-5 lemons, plus a big helping of their zest
3/4 cup sugar
100 g butter, cut into cubes
You'll need to set up a steam double boiler for this recipe. Luckily, making a steam double boiler is nowhere near as complicated as it sounds. The end result you're shooting for is basically a saucepan with a mixing bowl inside it. The diameter of the mixing bowl should be greater than the diameter of the saucepan, so that the bowl sits on the saucepan's rim. Between the saucepan and the mixing bowl will be a layer of boiling water, not quite deep enough to touch the mixing bowl's bottom. Inside the mixing bowl will be lemon curd.
So, now that you've got this picture fixed in your mind, take the saucepan, and put some water in it (not quite enough water to touch the mixing bowl's bottom). Put the water on the stove to boil. While it boils, combine all the ingredients in the mixing bowl. When the water boils, put the bowl on top of the saucepan. Stir the lemon curd constantly until it thickens. (I find that after 15-20 minutes, it changes suddenly from a liquid to a sort of pudding thing). Take the lemon curd off the heat and let cool.
lemon sponge cake
1 cup flour
1 tsp baking soda
1 cup sugar
juice of 1 lemon
Sift together the flour and the baking soda. Combine the eggs, sugar, and lemon juice in a separate bowl, and beat until huge and fluffy (you're looking for this mixture to triple in size). Fold in flour, and bake at 425 degrees Farenheit for 15 minutes.
Serve with tea and cucumber sandwiches.