Overnight Apple French Toast

Ingredients

• Unsalted butter, at room temperature, for greasing
• 12 to 16 slices (about 2cm thick) egg bread
• 6 eggs
• 375ml 2% or whole milk
• 60ml heavy cream
• 54g brown sugar
• 1 1/2 tsp cinnamon
• 1 1/2 tsp vanilla extract
• 1/4 tsp freshly grated nutmeg
• 1/4 tsp kosher salt
• 1 tart apple, peeled and grated
• Apple cider syrup: recipe follows
• For the Apple Cider Syrup:
• 160g brown sugar
• 2 tbsp cornstarch
• 1 tsp cinnamon
• 1/8 tsp grated nutmeg
• 375ml apple cider
• 2 tbsp lemon juice
• 3 tbsp unsalted butter