If you have a sourdough starter, you have to make these... trust me.
slightly adapted from here
2 cups active sourdough starter
1 tablespoon honey
1 teaspoon fine sea salt
1 teaspoon baking soda
Put all the ingredients into a bowl and whisk them together. The batter will be light and airy.
Heat a frying pan over low heat and spray it and 4 egg rings with cooking oil spray. Put the egg rings in the pan and pour the batter into the rings, to about ¾ full. Don't overfill, as the batter will puff up while cooking. Cook until the tops are covered with tiny holes, this can take 5 minutes or so. Remove the rings, flip the crumpets and cook on the other side for 1 - 2 minutes until golden.
You can serve them hot, straight out of the pan or let them cool and toast them when your ready to serve.