method
1. Melt the butter or margarine in a saucepan over a gentle heat and stir in the biscuit crumbs with the lemon rind and salt and pepper to taste.
2. Press evenly over the bottom of a greased loose-bottomed 18-20 cm/7-8 inch round cake tin. Chill while you make the filling.
3. Mash the avocado flesh with the lemon rind and juice.
4. Soften the herb-flavoured cheese in a large mixing bowl. Beat in the egg yolks, soured cream, mashed avocado and salt and pepper to taste.
5. Put the gelatine and water into a small heatproof bowl over a saucepan of hot water and stir until the gelatine has dissolved.
6. Beat the gelatine into the cheese mixture. Leave to one side until the mixture is on the point of setting.
7. Whisk the egg whites until stiff and fold lightly but thoroughly into the cheese mixture.
8. Spoon the mixture into the prepared tin and shake the tin gently to level the surface. Chill for 3-4 hours or until the filling is set.
9. Ease the sides of the tin carefully away from the cheesecake and lift the set cheesecake out on the tin base.
10. For the topping, toss the avocado slices in the lemon juice.
11. Garnish the cheesecake with the slices of avocado and small sprigs of tarragon.
serving amount
serves 6-8
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