Preheat the oven to 200C/400F/Gas 6.
Lightly grease the sides of a 23cm/9in tart tin with a removable bottom and place a disc of greaseproof paper on the base. If you prefer, you can serve this tart on the tart tin base, in which case do not use a disc of paper.
Sieve the icing sugar and flour into a clean bowl and stir in the ground almonds and lemon zest.
Place the free-range egg whites into another clean bowl. Whisk the egg whites for 30 seconds, until just frothy.
Add the whisked egg whites and warm melted butter to the bowl containing the dry ingredients. Mix the ingredients until the Ingredients combine and become smooth. Then pour the mixture into the prepared tart tin.
Arrange the pieces of pear on the top of the mixture and sprinkle the flaked almonds onto the top of the pears.
Transfer the tin to the oven and bake for 15 minutes, then turn down the heat of the oven to 180C/350F/Gas 4 and cook for a further ten minutes or until the mixture has risen and has a pale golden colour. The filling should feel firm to the touch in the centre when cooked through. Remove the tin from the oven and allow it to sit in the tin for a few minutes before turning it out onto a wire rack.
To serve, place the tart on a clean plate and dust with icing sugar.
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