Prepare the Filling: In a large bowl, combine cottage cheese, eggs, crème fraîche, and salt. Mix until smooth and creamy. For an added layer of complexity, consider stirring in a tablespoon of finely grated lemon zest or a touch of Dijon mustard.

Prepare the Fillo Pastry: Preheat oven to 375°F (190°C). Lightly grease a 9-inch tart pan.

Assemble the Tart: Lay one sheet of fillo pastry in the prepared tart pan, pressing it gently into the corners. Brush with melted butter. Repeat with remaining sheets, overlapping edges and brushing each layer with butter. Reserve 2 sheets for the top.

Create the Filling Layer: Pour cottage cheese mixture into the prepared pastry shell.

Top with Fillo: Cut remaining fillo sheets into strips. Weave or crisscross the strips over the filling to create a lattice top. Brush with beaten egg.

Bake: Bake for 30-35 minutes, or until golden brown and filling is set.

Serve: Let cool slightly before serving. Garnish with fresh herbs, if desired.