For the pastry
- 140g unsalted butter
- 100g icing sugar
- 2 large egg yolks, beaten
- 1 vanilla pod, seeds scraped out
- zest 1 lemon
- 2 tbsp cold milk
- 250g plain flour
For the lemon filling
- 6 eggs
- 140g caster sugar
- 4 unwaxed lemons, zest and juice
- 175ml double cream
For the meringue
- 300g caster sugar
- 25g liquid glucose
- 4 egg whites
- limoncello, ice-cold, to serve, optional
- First make the pastry. Either by hand or using a food mixer with a beater attachment, cream the butter, icing sugar, egg yolks, vanilla and lemon zest together. Add the milk and combine well. Tip in the flour and a pinch of salt, then rub or beat to form a dough. Shape into a thick disc and chill for at least 30 mins or overnight.
- Meanwhile, make the lemon filling. Beat the eggs and sugar together then add the zest and juice and stir in the double cream. Cover and put to one side.
- Heat oven to 180C/160C fan/gas 4. Roll pastry out to a little thicker than a £1 coin and line a 23cm tart tin. Leave the excess pastry around the edges as this can be cut off when the tart has been cooked. Line the tart case with greaseproof paper, fill with baking beans and bake for 20 mins. Remove the baking beans and reduce the heat to 160C/140C fan/gas 3 and cook for another 20 mins. Remove from the oven and allow to cool. Trim off the excess pastry from the edge of the tart using a serrated knife.
- Pour the lemon mix into the tart case. This may be easier with the tart case sitting in an open oven as so not to have to move it when full of mixture. Turn the oven to 140C/120C fan/gas 1 and cook for 30-35 mins until set with a slight wobble in the centre. Remove and cool to room temperature.
- For the meringue, put the sugar, 65ml of water and the glucose in a heavy bottomed pan on a medium heat and stir to dissolve the sugar. Once it is dissolved, bring to the boil and use a sugar thermometer to keep an eye on the temperature.
- Using a pastry brush dipped into cold water, brush down the inside of the pan just above the level of the sugar syrup, this will stop the sugar crystallising. Place the egg whites into a food mixer with a whisk attachment and when the syrup temp reaches 110C, turn on the mixer and whisk the whites
- When the temperature reaches 118C (soft ball – this will be marked on the sugar thermometer), steadily pour the sugar syrup in a thin stream into the now stiff egg whites and continue whisking for 20 mins until completely cold. Transfer into a piping bag with a medium-size star nozzle. As it is cooked, this meringue can be made in advance. You can even make it the day before.
- You can pipe the meringue onto the tart as a whole or in individual portions, then glaze with a blowtorch. It can be easier and neater to cut the slices before piping with meringue. They can still be served in tart formation on a serving dish, with an ice-cold glass of limoncello, if you like.
For the filling
- 1 tbsp rapeseed oil
- 1 onion, chopped
- 3-4 thyme sprigs
- 2 carrots, diced (total weight 300g/11oz)
- 250g lean minced lamb (we used 10% fat)
- 1 tbsp plain flour
- 1 tsp vegetable bouillon powder, made up to 350ml/12fl oz stock with boiling water
- 227g can chopped tomatoes
- 1 tbsp tomato purée
- 400g can green lentils with no added salt, drained
- 1 tsp Worcestershire sauce
For the topping
- 650g Maris Piper or King Edward potatoes, roughly chopped
- 250g sweet potatoes, roughly chopped
- 2 tbsp half-fat crème fraîche
- 1 tbsp semi-skimmed milk
- Heat the oil in a large, deep sauté pan or saucepan. Tip in the onion and thyme sprigs and fry for 2-3 mins. Then add the carrots and fry together for 5-8 mins, stirring occasionally until the vegetables start to brown. Stir in the mince to break it down. Fry for 1-2 mins until no longer pink. Stir in the flour, scraping the bottom of the pan in case the meat sticks, then cook for another 1-2 mins. Pour in the stock and stir until thickened. Stir in the tomatoes, tomato purée, lentils and Worcestershire sauce and season with pepper. Reduce the heat and simmer, covered, for 45 mins, stirring occasionally.
- Meanwhile, prepare the topping. Drop all the potatoes into a large pan of boiling water. Bring back to the boil, then simmer for 12-15 mins or until the potatoes are tender. Drain well in a colander then tip back into the pan. Mash with a masher or, briefly, with an electric hand mixer until smooth. Beat in the crème fraîche and milk with a wooden spoon until light and fluffy. Heat oven to 200C/180C fan/gas 6.
- Spoon the meat into a 1.5 litre pie dish and remove the thyme sprigs. Top with the mash and smooth over with a knife. Use a fork to create a ridged pattern on top. Place the dish on a baking sheet and bake for about 20-25 mins until piping hot and the filling starts to bubble around the edges. If the top is not brown enough, pop it under the grill for 5 mins or so until the mash is crisp and golden. Let it sit for 5 mins then serve.