Savoury Chicken Crostata

Ingredients

• 1 3/4 cups all-purpose flour
• 1/3 cup stone-ground cornmeal
• 1 tsp kosher salt
• 1/2 cup Parmesan cheese, grated
• 2 tbsp thyme, fresh, finely-chopped
• 12 tbsp unsalted butter, cold
• 2/3 cups water
• extra virgin olive oil
• 2 Spanish onions, peeled, thinly sliced
• 1 tbsp brown sugar
• 2 tbsp balsamic vinegar
• salt, to taste
• pepper, to taste
• 1 egg, lightly beaten with 1 tablespoon water
• 2 cups baby spinach, chopped
• 1 cup chicken, cooked, shredded
• 1/2 cup Greek Feta, crumbled
• 3 tbsp slivered almonds, toasted
• 1 tbsp thyme, fresh, finely-chopped