Grilled Ahi Tuna with Taro and Chile Pepper Aioli

INGREDIENTS

• 1 large egg yolk
• 1 garlic clove, finely grated
• 2–4 Hawaiian chile pepper water (or hot sauce)
• 1 olive oil
• Kosher salt, freshly ground pepper
• 2 taro root or russet potato, peeled, cut into 1 inch pieces
• 5 vegetable oil, divided
• 6 unsalted butter, cut into 1/2-inch pieces, divided
• 3 fresh tuna loin