Duchess Sweet Potatoes | RICARDO

Ingredients

• 8 cups (1.3 kg) peeled and cubed potatoes
• 4 cups (600 g) peeled and cubed sweet potatoes
• 4 garlic cloves, peeled
• 1/2 cup (115 g) butter
• 1/2 cup (125 ml) 35% heavy cream
• 1 egg
• 2 egg yolks
• 1 cup (70 g) freshly grated Parmesan cheese, plus more for sprinkling
• Chervil (optional)