Natas with beer caramelized pears - Le Coup de Grâce

Ingredients

• 2 tablespoons butter
• 2 ripe Bartlett pears, peeled and finely diced
• 2 tablespoons maple syrup
• 2 tablespoons Éphémère Pear beer from Unibroue
• 1 dash of ground nutmeg
• Butter
• 1 cup milk
• 3 tablespoons corn starch
• 1 cup white sugar
• 1/2 vanilla pod
• 6 egg yolks
• 500g puff pastry, thawed
• Icing sugar ( optional )