I use a recipe from Sophie Hansen's cookbook, which I've adapted to include some leftover sourdough starter. If you don't have any starter, the recipe will work just fine without it.
You will need:
1 cup self-raising flour
1 cup milk
Finely grated zest of one lemon
1 tbsp caster sugar
3/4 cup active sourdough starter
Place all of the ingredients into a medium sized bowl and whisk to combine. Set aside for 20 minutes.
Heat a fry pan on medium-high heat and add a small knob of butter. Cook 2 tablespoons of batter at a time, flipping each pikelet when the surface begins to bubble.
Keep your growing pile of pikelets in an oven on low heat to keep them warm.