Sausage and Apple Galette with Mustard Glaze

**Make the Dough:** In a large bowl, whisk together flour and salt. Cut in cold butter using a pastry blender or your fingers until the mixture resembles coarse crumbs. Gradually add ice water, 1 tablespoon at a time, mixing until the dough just comes together. Flatten into a disc, wrap in plastic wrap, and refrigerate for at least 30 minutes.

**Prepare the Filling:** While the dough chills, heat a large skillet over medium heat. Add sausage and cook, breaking it up with a spoon, until browned. Drain off any excess grease. Add onion and garlic to the skillet and cook until softened, about 5 minutes. Stir in sliced apples and thyme, and cook for another 3-5 minutes, or until the apples are slightly softened.

**Assemble the Galette:** Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper. On a lightly floured surface, roll out the dough into a 12-inch circle. Transfer the dough to the prepared baking sheet.

**Add Filling and Bake:** Spread the sausage and apple mixture evenly over the dough, leaving a 2-inch border. Fold the edges of the dough over the filling, pleating as needed. In a small bowl, whisk together Dijon mustard and honey. Brush the edges of the galette with the mustard glaze. Brush the edges with the beaten egg.

Bake for 30-35 minutes, or until the crust is golden brown and the filling is heated through. Let cool slightly before slicing and serving.