1. Preheat oven to 120°C. Lightly grease a baking tray and line with baking paper.
2. Whisk egg whites and a pinch of salt in an electric mixer until soft peaks form (3-4 minutes), then gradually add sugar and whisk until stiff and glossy. Fold in cornflour, vinegar, lime rind and coconut. Spoon onto baking tray in a 22cm- diameter pile, forming high sides.
3. Bake until crisp on the outside, but not coloured (11/2-2 hours), turn off oven and cool completely in oven (3-4 hours or overnight if you prefer).
4. For the passionfruit jam, process passionfruit in a food processor to crack seeds, strain into a saucepan and return a third of the seeds to the juice. Add sugar and vanilla seeds and stir over
medium-high heat to dissolve sugar, bring to the boil and cook until jammy (6-8 minutes).
5. Remove from heat, stir in lime juice, then refrigerate until cooled and set (1-2 hours). Passionfruit jam will keep refrigerated for a week.
6. Whisk crème fraîche and icing sugar in a bowl to soft peaks, fold in a third of the passionfruit jam, then pile onto pavlova shell.
7. To serve, top with remaining passionfruit jam and toasted coconut.