Quince Tart

Pastry

• 7 oz unsalted butter, room temperature, plus extra to grease
• 2 large eggs, divided
• 5 oz sugar
• 1 lemon, zest only, no white pith
• 1 pinch salt
• 14 oz all-purpose flour
• 1 tbsp baking powder

Filling

• 25 oz quince paste, cut into pieces (see Tip)
  ή 25 oz guava paste, cut into pieces (see Tip)
• 2 ½ oz sweet wine (e.g. Port, Marsala, Brandy)