Preheat the oven to gas 4, 180°C, fan 160°C. Grease a 23cm spring clip cake tin with butter on the base and all around the sides.
Put the cheese, eggs, cream, lemon zest and 5 tbsp of the sweetener in a food processor and blend on the pulse setting until just combined. Pour all the cheese mixture slowly into the prepared cake tin and put on a baking tray. Bake in the centre of the oven for 15 minutes.
Reduce the oven temperature to gas 3, 160°C, fan 140°C and cook for a further 25-30 minutes or until the cheesecake is just set – it should still have a bit of a wobble. If the cheesecake does start to brown while it is still very wobbly, cover the tin loosely with a large piece of foil.
When the cheesecake is ready, turn the oven off and open the door slightly. Wedge a folded tea towel or wooden spoon in the door to keep it ajar and leave the cheesecake to cool for 2-3 hours. This should prevent the surface from cracking although the surface may wrinkle a little. Transfer to the fridge and chill for at least 2 hours before removing from the tin. Slide a knife around the edge of the cheesecake, and release gently from the tin. Slide carefully off the tin base onto a serving plate.
To serve, top with fresh raspberries and some mint leaves for garnish, if liked.
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