Mixed berry jam tart

Mixed berry jam

• 1 lemon
• 500 g mixed berries, fresh (e.g raspberries, blackberries, blueberries) (see tip)
• 250 g raw sugar
• 1 vanilla pod, split lengthways, seeds scraped

Pastry

• butter for greasing
• 1 lemon, zest only, no white pith
• 300 g plain flour
• 3 egg yolks
• 100 g sugar
• 1 pinch salt
• 150 g butter, chilled, cut into pieces
• 30 g milk, for brushing
• 30 g shredded coconut, toasted, to garnish (可选的)