Truffle Potato Gratin | Chef's Complements

Ingredients

• 1 tbsp butter, for preparing dish
• 1.3kg Idaho potato (Agria in NZ)
• 3 tsp salt, divided
• 1 tbsp olive oil
• 1 tbsp truffle oil, plus more for drizzling
• 2 yellow onions, sliced
• ½ cup chicken broth
• 1½ cups heavy cream
• 1 bunch thyme, reserving a few sprigs for garnishing
• 2 bay leaves
• 1½ cups shredded Gruyere cheese
• ¼ cup creme fraiche
• Salt and pepper, to taste
• Chopped chives and thyme for garnishing
• Flaky sea salt for finishing