Crush the biscuits until they look like lumpy sand. (I do mine in a food processor because I'm lazy!)
Mix with the melted butter and press into your tin.
Combine the whipped cream, icing sugar, cream cheese, lemon juice and half of one tin of caramel (about 200g/7oz). Fold in gently until fully combined.
Smooth on top of the biscuit base, dotting the remainder of one of the tins of caramel through it as you go (about 200g/7oz), and flatten the top with the back of a spoon or a palette knife if you have one.
Pop into the freezer for at least 2 hours or overnight.
Remove the cheesecake from the tin (see notes below).
Pour the rest of the caramel over the top. Sprinkle with the sea salt.
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