Italian Bomboloni Doughnuts (The Best)

Ingredients

• Doughnuts

  • ½ cup (125 ml) warm water
  • 4 tsp instant dry yeast
  • 1 cup (250 ml) 35% cream
  • 1 clementine (or ½ orange), zest finely grated
  • 1 lemon, zest finely grated
  • 1 tsp (5 ml) vanilla extract
  • 4 ½ cups (675 g) unbleached all-purpose flour
  • ½ cup (105 g) sugar
  • 1 tsp salt
  • 4 egg yolks
  • 3 eggs
  • Corn or vegetable oil, for frying
  • Sugar, for coating

• Pastry Cream

  • 1 cup (210 g) sugar
  • 1/3 cup (50 g) unbleached all-purpose flour 
  • 2 tbsp cornstarch
  • 6 egg yolks
  • 2 eggs
  • 4 cups (1 litre) warm milk
  • 2 tsp vanilla extract