Ingredients

Filling
2 (10-ounce) bags curly leaf spinach, rinsed
1/4 cup water
12 ounces feta cheese, rinsed, patted dry, and crumbled into fine pieces (about 3 cups)
3/4 cup whole-milk Greek yogurt (see note)
4 medium scallions, sliced thin (about 1/2 cup)
2 large eggs, beaten
1/4 cup minced fresh mint leaves
2 tablespoons minced fresh dill leaves
3 medium garlic cloves, minced or pressed through garlic press (about 1 tablespoon)
1 teaspoon grated zest plus 1 tablespoon juice from 1 lemon
1 teaspoon ground nutmeg
1/2 teaspoon ground black pepper
1/4 teaspoon table salt
1/8 teaspoon cayenne pepper
Phyllo Layers
7 tablespoons unsalted butter, melted
1/2 pound (14 by 9-inch) phyllo, thawed (see note)
1 1/2 ounces Pecorino Romano, grated fine (about 3/4 cup)
2 teaspoons sesame seeds (optional)