Vegan Onion Tart with White Grape Reduction - Kosher.com

Ingredients

• 1 Gefen Puff Pastry Sheet (about 9 inches x 9 inches)
• 2 tablespoons extra virgin olive oil
• 2 large sweet onions, sliced thin
• 1/2 teaspoon sea salt
• 1/4 teaspoon ground black pepper
• 3 tablespoons light brown sugar
• 4 teaspoons white grape reduction, divided
• 2 teaspoons Tuscanini Apple Cider Vinegar
• 1/2 cup water
• 1/2 teaspoon dried thyme, chopped
• 2 tablespoons grain mustard
• 2 tablespoons unsweetened plant-based milk such as Gefen Almond Milk or oat milk (optional)