Cook the Book: Puy Lentil Galettes

Name: Cook the Book: Puy Lentil Galettes
Ingredients: 1 cup puy (french) lentils; 2 bay leaves; 2 teaspoons cumin seeds; 2 teaspoons coriander seeds; 5 tablespoons olive oil, plus extra to finish; 1 medium onion, roughly chopped; 2 garlic cloves, crushed; 1 1/4 cups greek yogurt; 2 cups baby spinach leaves; 3 tablespoons chopped cilantro; 3 tablespoons chopped mint; Juice of 1 lemon; Salt and black pepper; 14 ounces best-quality puff pastry; 1 egg, beaten