Set the oven to 200 degrees Celcius. Blend the lemon with its peel still on, add the sugar and mix well. Throw in the remaining ingredients (except for the pears) and remember to grate the marzipan and beat the egg in advance. Then pour the mixture into the partially pre-baked tart shell (see link to recipe above) and arrange the pear slices in the filling as you like. I am ashamed to admit that I used tinned pears for the picture above. It was purely bad habit and it wasn’t quite as lovely as it would have been with a pear that had more texture and charater left in it. Anyway, put the tart just below the middle of the oven and let it bake for about 40 mins. Check it with a pin. The texture should be firm, but slightly sticky. Make sure you also check its colour towards the end as it can turn dark pretty quickly. If it turns brown early, you can always place at large piece of tin foil on top of it (don’t tuck in the sides, just leave it loose) or try with another baking tray above the tart. Leave to cool for 20 mins and serve. Perfect for those long November afternoons.