½ lemon, zest finely grated (optional)
1 tsp baking powder
3 tbsp soft light brown sugar
1 tsp cinnamon
2 tsp ground ginger
100ml/3½fl oz maple syrup
pinch salt
225g/8oz self-raising flour
4 tbsp sunflower oil
½ vanilla pod, or a couple of drops of vanilla extract (optional)
100ml/3½fl oz sour cream or crème fraîche
1 medium free-range egg
300ml/½ pint semi-skimmed milk
12 slices Parma ham or bacon