Layered Pumpkin and Cheese Gratin Squares (Boureki) | Saveur

Ingredients

• 4 ¹⁄₂ lb. russet potatoes, peeled and thinly sliced
• 3 sugar pumpkins or small butternut squash (1¼ lb.), peeled and thinly sliced
• 1 tbsp. kosher salt
• 1 tsp. freshly ground black pepper
• 1 tbsp. plus 1 tsp. all-purpose flour
• ¹⁄₄ cup finely chopped fresh mint
• 2 lb. mizithra cheese (4 cups), or substitute 10 oz. sheep’s milk feta and 12 oz. sheep’s milk ricotta, blended in a food processor and drained overnight in a fine strainer
• ³⁄₄ cup extra-virgin olive oil