Put all ingredients, except the grated carrot and sultanas in a food processor and whiz until you get a smooth batter.
Whiz for a few seconds and add more milk, if needed - the batter should be similar to single cream. Fold in the grated carrot and sultanas - now the batter should be a bit thicker but still pourable.
Heat the waffle maker. Once it’s hot, spoon in some batter, let it spread out, then close the top. Following the machine instructions, cook the waffles for about 3-5 minutes - they should be golden and crispy on the outside, soft inside. You should be able to get 3 or 4 waffles from the mixture (depending on the size of your machine).
Serve warm or at room temperature.