French Lemon Tart - Tarte au Citron

Tart crust:

1. Make tart crust per linked recipe, including blind baking the empty tart crust. Allow to fully cool before filling (to ensure it won't go soggy).

Lemon Tart filling:

1. Preheat oven: Preheat oven to 180℃/350℉ (160℃ fan)
2. Whisk ingredients together: Put all ingredients in a medium saucepan and whisk to combine.
3. Thicken on stove: Place the saucepan on the stove over low / medium low heat. Whisk constantly, especially as the butter is melting, to ensure it doesn't split. Keeping stirring until the mixture thickens enough to visibly mound (ie. holds its shape briefly) on the surface when dolloped – about 5 minutes, though it might take longer depending on stove strength, saucepan heat retention etc. See video and photos for thickness guide. Don't take it off the stove until it's thick enough otherwise the Filling won't set.
4. Strain into a bowl using a fine mesh strainer.
5. Fill tart: Pour into tart shell and smooth the filling surface using an offset spatula or similar.
6. Bake: Bake for 5 minutes. It will still be a soft custard when you touch it but not liquidity. It will set more when cooled so it's sliceable.
7. Cool: Cool tart fully to allow it to set before slicing to serve. Pictured with a dollop of creme fraiche (a thick, rich cream that has a slight tartness, and goes very well with the lemon tart) or whipped cream and even vanilla ice cream.
8. Decorate if desired with lemon slices, edible flowers, raspberries. Else pipe on dollops of whipped cream or dust with icing sugar!