Cut whole orange, skin and all, into four wedges. Remove any seeds and drop into blender or processor. Add the orange juice and process to puree consistency. Add egg, oil and sugar and beat until blended.

In a separate bowl, stir dry ingredients together and then add to orange mixture and stir by hand jut enough to combine thoroughly.

Gently stir in raisins and spoon into 12 greased muffin tins.