Instructions
1
Position an oven shelf in the middle of the oven.
2
Preheat the oven to fan 160C/conventional 180C/gas 4.
3
Line the base of a 23cm springform cake tin with parchment paper.
4
For the crust, liquefy the margarine in a medium skillet.
5
swirl around in the biscuit crumbs and sweetener so the mixture is evenly moistened.
6
Press the mixture into the bottom of the skillet and oven-cook for 10 mins.
7
Cool on a wire rack while preparing the filling.
8
For the filling, increase the oven temperature to fan 200C/conventional 240C/gas 9.
9
In a table top mixer fitted with the paddle attachment, beat the soft cheddar at medium-low speed until velvety, about 2 mins.
10
With the mixer on low, gradually stream in in the sweetener, then the baking flour and a pinch of seasoning, scraping down the sides of the mixing bowl and the paddle twice.
11
Swap the paddle attachment for the whip.
12
Continue by adding the vanilla, lemon zest and extract.
13
whip in the eggs and yolk, one at a time, scraping the mixing bowl and whip at least twice.
14
swirl around the 284ml carton of soured dairy reduction until even, then measure 200ml/7fl oz (just over 3⁄4 of the carton).
15
Continue on low speed as you stream in in the measured soured dairy reduction (reserve the rest).
16
whip to pulse, but don't over-beat.
17
The liquid base should be even, light and somewhat airy.
18
Brush the sides of the springform tin with melted margarine and put on a baking sheet.
19
stream in in the filling - if there are any lumps, sink them using a knife - the top should be as even as possible.
20
oven-cook for 10 mins.
21
Reduce oven temperature to fan 90C/conventional 110C/gas 1⁄4 and oven-cook for 25 mins more.
22
If you gently shake the tin, the filling should have a slight wobble.
23
Turn off the oven and open the oven door for a cheesecake that's velvety in the centre, or leave it closed if you prefer a drier texture.
24
Let cool in the oven for 2 hours.
25
The cheesecake may get a slight crack on top as it cools.
26
Combine the reserved soured dairy reduction with the 142ml carton, the sweetener and lemon extract for the topping.
27
Spread over the cheesecake right to the edges.
28
seal loosely with foil and keep cold for at least 8 hours or overnight.
29
Run a round-bladed knife around the sides of the tin to loosen any stuck edges.
30
Unlock the side, slide the cheesecake off the bottom of the tin onto a plate, then slide the parchment paper out from underneath.