Georgian-spiced Zucchini Gratin - Robert Sinskey Vineyards & Wilding Farm

Ingredients

• Extra virgin olive oil
• 4 pound large zucchini, seeded and sliced thinly
• 1 yellow onion, slice thinly
• 1½ cups finely grated Parmesan, divided
• 1½ tablespoons Svanetian salt, divided
• Freshly ground black pepper
• 1 lemon to zest over the layers
• 1 cup heavy cream, optional