A note on rhubarb: cooking the rhubarb ahead of time and storing it in the fridge in its cooking liquid will encourage it to turn pink.
Rub the flour and butter together until the mixture resembles fine breadcrumbs. Stir in the icing sugar and pinch of fine salt. Add the egg and bring together into a dough. Lightly form into a disc, wrap and chill for at least 1 hour – try not to overwork the dough
Preheat the oven to 200°C. Place the rhubarb in a roasting tray with the sugar, orange juice and vanilla. Roast for 10-12 minutes until just tender but still holding its shape (it will continue to cook in its residual heat). Carefully remove and allow to cool in its liquid
Once the pastry is chilled, roll out the pastry approximately 3mm thick. Line the tart tin, pressing the pastry into the corners, then trim the edges. Chill for a further 30 minutes – this helps prevent shrinkage during baking
Line the pastry case with baking paper, fill with baking beans and blind-bake for 15 minutes. Carefully remove the paper and beans, then return the case to the oven for 5-7 minutes until lightly golden and dry. Set aside and reduce the oven temperature to 190°C
For the frangipane, cream the butter and sugar together in a stand mixer fitted with a beater attachment until combined. Add the eggs in three additions, combining well and scraping down the sides of the bowl
Fold in the ground almonds, flour, lemon zest, vanilla and a pinch of salt on a slow speed, scraping down the sides of the bowl as needed, until combined
Spread the frangipane evenly into the tart shell. Arrange the rhubarb neatly on top. Bake for 35-40 minutes, until the frangipane is set and lightly golden. Remove and allow to cool slightly before removing from the tin to cool completely – make sure to release the tart from the tin before it cools completely, otherwise the pastry will stick to the tin
Whilst the tart is still warm, make a glaze by warming the apricot jam and water in a small pan. Brush over the rhubarb while the tart is still warm, then leave to cool completely. Serve with candied pistachios, extra poached rhubarb and some vanilla crème fraîche
Please sign in or register to send a comment to Great British Chefs.