1 Lemon syrup Combine all the ingredients in a heavy-based saucepan over low heat until the sugar dissolves. Remove from the heat and set aside.
2 Doughnuts Place the flour, salt and sugar in an electric mixing bowl fitted with a dough hook. Mix slowly until the ingredients are thoroughly blended.
3 Crumble the yeast into the milk and crush it with the back of a spoon to dissolve. Pour the yeast into the bowl and mix. Add the egg, increase the speed of the mixer and mix until the dough comes together in a ball. Add the butter, piece by piece, until fully incorporated. Check the consistency of the dough – if it seems too wet, add a little more flour.