How to Make It
In a skillet, combine lemon juice, water, garlic cloves, and 1 teaspoon kosher salt. Bring to a simmer and cook spinach in batches until just wilted. Drain and set aside.
Heat oven to 400° F. In a large bowl, combine the spinach, Parmesan, ricotta, scallions, egg, salt, and pepper. Mix well and set aside.
Fold 1 sheet of phyllo in half crosswise and place on a lightly greased baking sheet. Brush the top with some of the butter. Top with another folded sheet and brush with more butter. Repeat one more time. Leaving a 2-inch border around the edges, place 1/4 of the spinach mixture at one end of the pastry. Roll up the pastry, tucking in the sides. Brush with more butter. Repeat to make 3 more individual pockets.
Bake in the oven until puffed and golden, about 30 minutes.