Combine the flour, icing sugar and salt a food processor or bowl, if doing by hand.
Add the cold butter cubes and pulse until the largest pieces of butter are just bigger than pea-size. Add the vanilla essence, white vinegar and egg yolk. Pulse on medium speed just until the dough starts just clumping together, 6-10 times. It will still be crumbly but should hold together if you pinch it between your fingers. Add a tablespoon of ice water if it seems too dry. Tip out onto a lightly floured surface, bring together with your hands and firmly press into a disc. Wrap in cling film and refrigerate for at least 2 hours or overnight.
Grease a rectangular tart tin. Roll out the pastry on a lightly floured bench to just bigger than your tin and line the tart tin, pressing firmly into the sides. If it is too hard to roll, leave it at room temperature for 10 minutes to soften a little. If it rips at all or you find that one edge is too thin, it is easy to use the leftover pastry scraps to patch it back together.
Trim the pastry to form a neat edge - I usually roll my rolling pin over the edge to cut through the pastry. Use your fingers to press the pastry edges up the sides of the tin so the top sits just above the level of the tin - this helps if it shrinks a little while baking.
Rest the lined tart tin in the freezer for at least 30 minutes.
Preheat the oven to 180°C. Line the pastry case with foil, then fill it with dry rice or pie weights and blind bake for 15 minutes. Remove the weights and foil, then return to the oven for a further 5-10 minutes, or until light golden and completely dry. Set aside while you make the filling.
Preheat oven to 180°C.
Bake covered (either with a lid or with a sheet of baking paper) for 20 minutes, then remove the lid, turn the pears over to coat with syrup and bake for a further 20 minutes until golden and tender.
Place the finely chopped chocolate in a bowl
Heat the cream and butter in a small saucepan until almost simmering and the butter has melted
Pour over the chopped chocolate and leave for 5 minutes. Use a whisk to combine into a smooth ganache.
Add the caster sugar and ground almonds and stir to just combine.
Starting from the middle, gently place honey baked pears in rows over the filling (you will probably have some left over - keep for serving with the tart)
Bake for 20-25 minutes or until the chocolate has just set with a little bit of wobble still in the middle.
Set aside to cool completely.
Dust very lightly with icing sugar before serving with any extra pears, ice cream and warm syrup.