Peel the mangoes and cut flesh from stones. Discard stones. Blend the flesh and lime zest until smooth. Empty into large bowl and whisk in yogurt.
Step 2
Put egg whites into a large, grease-free bowl and whisk until stiff but not dry. Add sugar and whisk until thick and glossy. Using a large metal spoon, fold the whites into the mango mixture. Divide among six glasses and chill until needed.
Step 3
Cut passion fruits in half and scrape the pips and juice into a bowl. Top each mousse with a teaspoonful of passion fruit and serve.
For a smooth purée, make sure that the mangoes are ripe - they should be soft, with a sweet scent.
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